Katrinabooks (91 Ergebnisse)

Paperback. Zustand: new. Paperback. arentage and birth of Scott-Precocity-EntersWilliam andMary College-Leaves college and commences the study of law with Judge Robinson-Attends the trial of Burr at Richmond-Impressment of American seamenand proclamation of President Jefferson-Joins the Petersburg troop-Leavesfor Charleston-Returns to Petersburg-Appointed captain of artillery-Trialof General Wilkinson-Scott sends in his resignation, but withdraws it andreturns to Natchez-Is court-martialed-On staff duty at New Orleans-Declarationof war with Great Britain-General Wade Hampton and the Secretary ofWar-Hull's surrender-Storming ofQueenstown-March to Lewiston-Scott'sappeal to the officers and soldiers-Indians fire on a flag of truce-Incidentwith a Caledonian priest-Letter in relation to Irish prisoners sent home tobe tried for treason.Winfield Scott was born at Laurel Branch, the estate of his father, four-teen miles from Petersburg, Dinwiddie County, Virginia, June 13, 1786. Hisgrandfather, James Scott, was a Scotchman of the Clan Buccleuch, and a fol-lower of the Pretender to the throne of England, who, escaping from the de-feat at Culloden, made hisway to Virginia in1746, where he settled. William, the son of this James, married Ann Mason, a native of Dinwiddie County3 MARCUS J. (MARCUS JOSEPH) WRIGHTand a neighbor of the Scott family. Winfield Scott was the issue of this mar-riage. There were an elder brother and two daughters. James Scott died at anearly age, when Winfield was but six years old. William, the father of Win-field, was a lieutenant and afterward captain in a Virginia company whichserved in the Revolutionary army. Eleven years after the father's death themother died, leaving Winfield, at seventeen years old, to make his own wayin the world.At the death of his father, Winfield, being but six years old, was left to thecharge of his mother, towhom hewas devotedly attached. It is awell-warrantedtradition of the county in which the Scott family resided, that the mother ofGeneral Scott was a woman of superior mind and great force of character.In acknowledging the inspiration from the lessons of that admirable parentfor whatever of success he achieved, he was not unlike Andrew Jackson andthe majority of the great men of the world. He wrote of her in his matureage as follows: "And if, in my now protracted career, I have achieved any-thing worthy of being written, anything that my countrymen are likely tohonor in the next century, it is from the lessons of that admirable parent thatI derived the inspiration."In his seventh year he was ordered on a Sunday morning to get ready forchurch. Disobeying the order, he ran off and concealed himself, butwas pur-sued, captured, and returned to his mother, who at once sent for a switch.The switch was a limb from a Lombardy poplar, and the precocious littletruant, seeing this, quoted a verse from St. Matthew which was from a les-son he had but recently read to his mother. The quotation was as follows: "Every tree that bringeth not forth good fruit is hewn down, and cast intothe fire." The quotation was so apt that the punishment was withheld, butthe offender was not spared a very wholesome lesson.Generbaptismal name of Winfield. John Winfield survived his daughter, and dy- From a precocious childhood shaped by a formidable mother to the tumultuous early years of military service, this narrative traces the formative struggles of a rising leader amidst the fires of war and political upheava Shipping may be from multiple locations in the US or from the UK, depending on stock availability.…

Zustand: New.

Paperback. Zustand: new. Paperback. . A machine is a combination of timbers fastened together, chiefly effica-cious in moving great weights. Such a machine is set in motion on sci-entific principles in circular rounds, which the Greeks call [Greek: kyklikekineois]. There is, however, a class intended for climbing, termed in Greek[Greek: akrobatikon], another worked by air, which with them is called[Greek: pneumatikon], and a third for hoisting; this the Greeks named[Greek: baroulkos]. In the climbing class are machines so disposed that onecan safely climb up high, by means of timbers set up on end and connectedby crossbeams, in order to view operations. In the pneumatic class, air isforced by pressure to produce sounds and tones as in an [Greek: organon].2. In the hoisting class, heavy weights are removed by machines which raisethem up and set them in position. The climbing machine displays no scien-tific principle, but merely a spirit of daring. It is held together by dowels andcrossbeams and twisted lashings and supporting props. A machine that getsits motive power by pneumatic pressure will produce pretty effects by scien-tific refinements. But the hoisting machine has opportunities for usefulness3 VITRUVIUS POLLIOwhich are greater and full of grandeur, and it is of the highest efficacy whenused with intelligence.3. Some of these act on the principle of the [Greek: mechane], others on thatof the [Greek: organon]. The difference between "machines" and "engines"is obviously this, that machines need more workmen and greater power tomake them take effect, as for instance ballistae and the beams of presses. En-gines, on the other hand, accomplish their purpose at the intelligent touch ofa single workman, as the scorpio or anisocycli when they are turned. There-fore engines, as well as machines, are, in principle, practical necessities, with-out which nothing can be unattended with difficulties.4. All machinery is derived from nature, and is founded on the teachingand instruction of the revolution of the firmament. Let us but consider theconnected revolutions of the sun, the moon, and the five planets, withoutthe revolution of which, due to mechanism, we should not have had thealternation of day and night, nor the ripening of fruits. Thus, when our an-cestors had seen that this was so, they took their models from nature, andby imitating them were led on by divine facts, until they perfected the con-trivances which are so serviceable in our life. Some things, with a view togreater convenience, they worked out by means of machines and their revo-lutions, others by means of engines, and so, whatever they found to be usefulfor investigations, for the arts, and for established practices, they took careto improve step by step on scientific principles.5. Let us take first a necessary invention, such as clothing, and see how thecombination of warp and woof on the loom, which does its work on theprinciple of an engine, not only protects the body by covering it, but alsogives it honourable apparel. We should not have had food in abundanceunless yokes and ploughs for oxen, and for all draught animals, had been in-vented. If there had been no provision of windlasses, pressbeams, and leversfor presses, we could not have had the shining oil, nor the fruit of the vine togive us pleasure, and these things could not be transported on land withoutthe invention of the mechanism of carts or waggons, nor on the sea Explore the divine mechanics of th Shipping may be from multiple locations in the US or from the UK, depending on stock availability.…

Paperback. Zustand: new. Paperback. t will be noticed that the ringer and the relay coil 6 at the first station arebridged across the sides of the line leading to the central office. In likemanner the bell and the relay magnets are bridged across the two limbs ofthe line leading into each succeeding station, but this bridge at each of thestations beyond Station A is ineffective because the line extension R_{x} isopen at the next station nearest the central office.In order to ring Station A it is only necessary to send out ringing currentfrom the central office. This current is in such direction as not to cause theoperation of the relay, although it passes through the coil 6. If, on the otherhand, it is desired to ring Station B, a preliminary impulse would be sentover the metallic circuit from the central office, which impulse would be ofsuch direction as to operate the relay at Station A, but not to operate the bellat that station. The operation of the relay at Station A causes the spring 2of this relay to engage the spring 3, thus extending the line on to the secondstation. After the spring 2 at Station A has been forced into contact withthe spring 3, it is caught by the latch of the spring 5 and held mechanically.When the impulse from the central office ceases, the spring 1 resumes itsnormal position, thus breaking the bridge circuit through the bell at that3 AMERICAN SCHOOL OF CORRESPONDENCEstation. It is apparent now that the action of coil 6 at Station A has madethe relay powerless to perform any further action, and at the same time theline has been extended on to the second station. A second similar impulsefrom the central office will cause the relay at Station B to extend the line onto Station C, and at the same time break the circuit through the operatingcoil and the bell at Station B. In this way any station may be picked out bysending the proper number of impulses to operate the line relays of all thestations between the station desired and the central office, and having pickedout a station it is only necessary to send out ringing current, which currentis in such direction as to ring the bell but not to operate the relay magnet atthat station.In Fig. 197, a four-station line, such as is shown in Fig. 196, is illustrated, butthe condition shown in this is that existing when two preliminary impulseshave been sent over the line, which caused the line relays at Station A andStation B to be operated. The bell at Station C is, therefore, the only onesusceptible to ringing current from the central office.Since only one bell and one relay are in circuit at any one time, it is obviousthat all of the current that passes over the line is effective in operating a sin-gle bell or relay only. There is no splitting up of the current among a largenumber of bells as in the bridging system of operating step-by-step devices, which method sometimes so greatly reduces the effective current for eachbell that it is with great difficulty made to respond. All the energy availableis applied directly to the piece of apparatus at the time it is being operated.This has a tendency toward greater surety of action, and the adjustment ofthe various pieces of apparatus may be made with less delicacy than is re-quired where many pieces of apparatus, each having considerable work todo, must necessarily be operated in multiple.The method of unlatching the relays has been briefly referred to. After a Explore the intricate mechanics of early telecommunications through a deep dive into the electrical impulses and relay systems Shipping may be from multiple locations in the US or from the UK, depending on stock availability.…

PAP. Zustand: New. New Book. Shipped from UK. Established seller since 2000.

Paperback. Zustand: new. Paperback. IThe human race has travelled a long way, since those remote ages when menfashioned their rude implements of flint and lived on the precarious spoilsof hunting, leaving to their children for their only heritage a shelter beneaththe rocks, some poor utensils-and Nature, vast, unknown, and terrific, withwhom they had to fight for their wretched existence.During the long succession of agitated ageswhich have elapsed since, mankindhas nevertheless amassed untold treasures. It has cleared the land, dried themarshes, hewn down forests, made roads, pierced mountains; it has beenbuilding, inventing, observing, reasoning; it has created a complex machin-ery, wrested her secrets from Nature, and finally it pressed steam and electric-ity into its service. And the result is, that now the child of the civilized manfinds at its birth, ready for its use, an immense capital accumulated by thosewho have gone before him. And this capital enables man to acquire, merelyby his own labour combined with the labour of others, riches surpassing thedreams of the fairy tales of the Thousand and One Nights.3 PETR ALEKSEEVICH KROPOTKIN, KNIAZThe soil is cleared to a great extent, fit for the reception of the best seeds, ready to give a rich return for the skill and labour spent upon it-a returnmore than sufficient for all the wants of humanity. The methods of rationalcultivation are known.On the wide prairies of America each hundred men, with the aid of pow-erful machinery, can produce in a few months enough wheat to maintainten thousand people for a whole year. And where man wishes to double hisproduce, to treble it, to multiply it a hundred-fold, he makes the soil, givesto each plant the requisite care, and thus obtains enormous returns. Whilethe hunter of old had to scour fifty or sixty square miles to find food for hisfamily, the civilized man supports his household, with far less pains, and farmore certainty, on a thousandth part of that space. Climate is no longer anobstacle. When the sun fails, man replaces it by artificial heat; and we seethe coming of a time when artificial light also will be used to stimulate veg-etation. Meanwhile, by the use of glass and hot water pipes, man rendersa given space ten and fifty times more productive than it was in its naturalstate.The prodigies accomplished in industry are still more striking. With theco-operation of those intelligent beings, modern machines-themselves thefruit of three or four generations of inventors, mostly unknown-a hundredmen manufacture now the stuff to provide ten thousand persons with cloth-ing for two years. In well-managed coal mines the labour of a hundred min-ers furnishes each year enough fuel to warm ten thousand families underan inclement sky. And we have lately witnessed the spectacle of wonderfulcities springing up in a few months for international exhibitions, withoutinterrupting in the slightest degree the regular work of the nations.And if in manufactures as in agriculture, and as indeed through our wholesocial system, the labour, the discoveries, and the inventions of our ancestorsprofit chiefly the few, it is none the less certain that mankind in general, aidedby the creatures of steel and iron which it already possesses, could alreadyprocure an existence of wealth and ease for every one of its members.4 PETR ALEKSEEVICH KROPOTKIN, KNIAZ As humanity masters the forces of nature and accumulates vast industrial wealth, a radical vision emerges: a world where techn Shipping may be from multiple locations in the US or from the UK, depending on stock availability.…

PAP. Zustand: New. New Book. Shipped from UK. Established seller since 2000.

PAP. Zustand: New. New Book. Shipped from UK. Established seller since 2000.

PAP. Zustand: New. New Book. Shipped from UK. Established seller since 2000.

PAP. Zustand: New. New Book. Shipped from UK. Established seller since 2000.

Paperback. Zustand: new. Paperback. arentage and birth of Scott-Precocity-EntersWilliam andMary College-Leaves college and commences the study of law with Judge Robinson-Attends the trial of Burr at Richmond-Impressment of American seamenand proclamation of President Jefferson-Joins the Petersburg troop-Leavesfor Charleston-Returns to Petersburg-Appointed captain of artillery-Trialof General Wilkinson-Scott sends in his resignation, but withdraws it andreturns to Natchez-Is court-martialed-On staff duty at New Orleans-Declarationof war with Great Britain-General Wade Hampton and the Secretary ofWar-Hull's surrender-Storming ofQueenstown-March to Lewiston-Scott'sappeal to the officers and soldiers-Indians fire on a flag of truce-Incidentwith a Caledonian priest-Letter in relation to Irish prisoners sent home tobe tried for treason.Winfield Scott was born at Laurel Branch, the estate of his father, four-teen miles from Petersburg, Dinwiddie County, Virginia, June 13, 1786. Hisgrandfather, James Scott, was a Scotchman of the Clan Buccleuch, and a fol-lower of the Pretender to the throne of England, who, escaping from the de-feat at Culloden, made hisway to Virginia in1746, where he settled. William, the son of this James, married Ann Mason, a native of Dinwiddie County3 MARCUS J. (MARCUS JOSEPH) WRIGHTand a neighbor of the Scott family. Winfield Scott was the issue of this mar-riage. There were an elder brother and two daughters. James Scott died at anearly age, when Winfield was but six years old. William, the father of Win-field, was a lieutenant and afterward captain in a Virginia company whichserved in the Revolutionary army. Eleven years after the father's death themother died, leaving Winfield, at seventeen years old, to make his own wayin the world.At the death of his father, Winfield, being but six years old, was left to thecharge of his mother, towhom hewas devotedly attached. It is awell-warrantedtradition of the county in which the Scott family resided, that the mother ofGeneral Scott was a woman of superior mind and great force of character.In acknowledging the inspiration from the lessons of that admirable parentfor whatever of success he achieved, he was not unlike Andrew Jackson andthe majority of the great men of the world. He wrote of her in his matureage as follows: "And if, in my now protracted career, I have achieved any-thing worthy of being written, anything that my countrymen are likely tohonor in the next century, it is from the lessons of that admirable parent thatI derived the inspiration."In his seventh year he was ordered on a Sunday morning to get ready forchurch. Disobeying the order, he ran off and concealed himself, butwas pur-sued, captured, and returned to his mother, who at once sent for a switch.The switch was a limb from a Lombardy poplar, and the precocious littletruant, seeing this, quoted a verse from St. Matthew which was from a les-son he had but recently read to his mother. The quotation was as follows: "Every tree that bringeth not forth good fruit is hewn down, and cast intothe fire." The quotation was so apt that the punishment was withheld, butthe offender was not spared a very wholesome lesson.Generbaptismal name of Winfield. John Winfield survived his daughter, and dy- From a precocious childhood shaped by a formidable mother to the tumultuous early years of military service, this narrative traces the formative struggles of a rising leader amidst the fires of war and poli Shipping may be from our Sydney, NSW warehouse or from our UK or US warehouse, depending on stock availability.…

PAP. Zustand: New. New Book. Shipped from UK. Established seller since 2000.

PAP. Zustand: New. New Book. Shipped from UK. Established seller since 2000.

PAP. Zustand: New. New Book. Shipped from UK. Established seller since 2000.

Paperback. Zustand: new. Paperback. arentage and birth of Scott-Precocity-EntersWilliam andMary College-Leaves college and commences the study of law with Judge Robinson-Attends the trial of Burr at Richmond-Impressment of American seamenand proclamation of President Jefferson-Joins the Petersburg troop-Leavesfor Charleston-Returns to Petersburg-Appointed captain of artillery-Trialof General Wilkinson-Scott sends in his resignation, but withdraws it andreturns to Natchez-Is court-martialed-On staff duty at New Orleans-Declarationof war with Great Britain-General Wade Hampton and the Secretary ofWar-Hull's surrender-Storming ofQueenstown-March to Lewiston-Scott'sappeal to the officers and soldiers-Indians fire on a flag of truce-Incidentwith a Caledonian priest-Letter in relation to Irish prisoners sent home tobe tried for treason.Winfield Scott was born at Laurel Branch, the estate of his father, four-teen miles from Petersburg, Dinwiddie County, Virginia, June 13, 1786. Hisgrandfather, James Scott, was a Scotchman of the Clan Buccleuch, and a fol-lower of the Pretender to the throne of England, who, escaping from the de-feat at Culloden, made hisway to Virginia in1746, where he settled. William, the son of this James, married Ann Mason, a native of Dinwiddie County3 MARCUS J. (MARCUS JOSEPH) WRIGHTand a neighbor of the Scott family. Winfield Scott was the issue of this mar-riage. There were an elder brother and two daughters. James Scott died at anearly age, when Winfield was but six years old. William, the father of Win-field, was a lieutenant and afterward captain in a Virginia company whichserved in the Revolutionary army. Eleven years after the father's death themother died, leaving Winfield, at seventeen years old, to make his own wayin the world.At the death of his father, Winfield, being but six years old, was left to thecharge of his mother, towhom hewas devotedly attached. It is awell-warrantedtradition of the county in which the Scott family resided, that the mother ofGeneral Scott was a woman of superior mind and great force of character.In acknowledging the inspiration from the lessons of that admirable parentfor whatever of success he achieved, he was not unlike Andrew Jackson andthe majority of the great men of the world. He wrote of her in his matureage as follows: "And if, in my now protracted career, I have achieved any-thing worthy of being written, anything that my countrymen are likely tohonor in the next century, it is from the lessons of that admirable parent thatI derived the inspiration."In his seventh year he was ordered on a Sunday morning to get ready forchurch. Disobeying the order, he ran off and concealed himself, butwas pur-sued, captured, and returned to his mother, who at once sent for a switch.The switch was a limb from a Lombardy poplar, and the precocious littletruant, seeing this, quoted a verse from St. Matthew which was from a les-son he had but recently read to his mother. The quotation was as follows: "Every tree that bringeth not forth good fruit is hewn down, and cast intothe fire." The quotation was so apt that the punishment was withheld, butthe offender was not spared a very wholesome lesson.Generbaptismal name of Winfield. John Winfield survived his daughter, and dy- From a precocious childhood shaped by a formidable mother to the tumultuous early years of military service, this narrative traces the formative struggles of a rising leader amidst the fires of war and poli Shipping may be from our UK warehouse or from our Australian or US warehouses, depending on stock availability.…

PAP. Zustand: New. New Book. Shipped from UK. Established seller since 2000.

PAP. Zustand: New. New Book. Shipped from UK. Established seller since 2000.

PAP. Zustand: New. New Book. Shipped from UK. Established seller since 2000.

PAP. Zustand: New. New Book. Shipped from UK. Established seller since 2000.

PAP. Zustand: New. New Book. Shipped from UK. Established seller since 2000.

PAP. Zustand: New. New Book. Shipped from UK. Established seller since 2000.

PAP. Zustand: New. New Book. Shipped from UK. Established seller since 2000.

Paperback. Zustand: new. Paperback. . A machine is a combination of timbers fastened together, chiefly effica-cious in moving great weights. Such a machine is set in motion on sci-entific principles in circular rounds, which the Greeks call [Greek: kyklikekineois]. There is, however, a class intended for climbing, termed in Greek[Greek: akrobatikon], another worked by air, which with them is called[Greek: pneumatikon], and a third for hoisting; this the Greeks named[Greek: baroulkos]. In the climbing class are machines so disposed that onecan safely climb up high, by means of timbers set up on end and connectedby crossbeams, in order to view operations. In the pneumatic class, air isforced by pressure to produce sounds and tones as in an [Greek: organon].2. In the hoisting class, heavy weights are removed by machines which raisethem up and set them in position. The climbing machine displays no scien-tific principle, but merely a spirit of daring. It is held together by dowels andcrossbeams and twisted lashings and supporting props. A machine that getsits motive power by pneumatic pressure will produce pretty effects by scien-tific refinements. But the hoisting machine has opportunities for usefulness3 VITRUVIUS POLLIOwhich are greater and full of grandeur, and it is of the highest efficacy whenused with intelligence.3. Some of these act on the principle of the [Greek: mechane], others on thatof the [Greek: organon]. The difference between "machines" and "engines"is obviously this, that machines need more workmen and greater power tomake them take effect, as for instance ballistae and the beams of presses. En-gines, on the other hand, accomplish their purpose at the intelligent touch ofa single workman, as the scorpio or anisocycli when they are turned. There-fore engines, as well as machines, are, in principle, practical necessities, with-out which nothing can be unattended with difficulties.4. All machinery is derived from nature, and is founded on the teachingand instruction of the revolution of the firmament. Let us but consider theconnected revolutions of the sun, the moon, and the five planets, withoutthe revolution of which, due to mechanism, we should not have had thealternation of day and night, nor the ripening of fruits. Thus, when our an-cestors had seen that this was so, they took their models from nature, andby imitating them were led on by divine facts, until they perfected the con-trivances which are so serviceable in our life. Some things, with a view togreater convenience, they worked out by means of machines and their revo-lutions, others by means of engines, and so, whatever they found to be usefulfor investigations, for the arts, and for established practices, they took careto improve step by step on scientific principles.5. Let us take first a necessary invention, such as clothing, and see how thecombination of warp and woof on the loom, which does its work on theprinciple of an engine, not only protects the body by covering it, but alsogives it honourable apparel. We should not have had food in abundanceunless yokes and ploughs for oxen, and for all draught animals, had been in-vented. If there had been no provision of windlasses, pressbeams, and leversfor presses, we could not have had the shining oil, nor the fruit of the vine togive us pleasure, and these things could not be transported on land withoutthe invention of the mechanism of carts or waggons, nor on the sea Explore the divine me Shipping may be from our Sydney, NSW warehouse or from our UK or US warehouse, depending on stock availability.…

Paperback. Zustand: new. Paperback. IThe human race has travelled a long way, since those remote ages when menfashioned their rude implements of flint and lived on the precarious spoilsof hunting, leaving to their children for their only heritage a shelter beneaththe rocks, some poor utensils-and Nature, vast, unknown, and terrific, withwhom they had to fight for their wretched existence.During the long succession of agitated ageswhich have elapsed since, mankindhas nevertheless amassed untold treasures. It has cleared the land, dried themarshes, hewn down forests, made roads, pierced mountains; it has beenbuilding, inventing, observing, reasoning; it has created a complex machin-ery, wrested her secrets from Nature, and finally it pressed steam and electric-ity into its service. And the result is, that now the child of the civilized manfinds at its birth, ready for its use, an immense capital accumulated by thosewho have gone before him. And this capital enables man to acquire, merelyby his own labour combined with the labour of others, riches surpassing thedreams of the fairy tales of the Thousand and One Nights.3 PETR ALEKSEEVICH KROPOTKIN, KNIAZThe soil is cleared to a great extent, fit for the reception of the best seeds, ready to give a rich return for the skill and labour spent upon it-a returnmore than sufficient for all the wants of humanity. The methods of rationalcultivation are known.On the wide prairies of America each hundred men, with the aid of pow-erful machinery, can produce in a few months enough wheat to maintainten thousand people for a whole year. And where man wishes to double hisproduce, to treble it, to multiply it a hundred-fold, he makes the soil, givesto each plant the requisite care, and thus obtains enormous returns. Whilethe hunter of old had to scour fifty or sixty square miles to find food for hisfamily, the civilized man supports his household, with far less pains, and farmore certainty, on a thousandth part of that space. Climate is no longer anobstacle. When the sun fails, man replaces it by artificial heat; and we seethe coming of a time when artificial light also will be used to stimulate veg-etation. Meanwhile, by the use of glass and hot water pipes, man rendersa given space ten and fifty times more productive than it was in its naturalstate.The prodigies accomplished in industry are still more striking. With theco-operation of those intelligent beings, modern machines-themselves thefruit of three or four generations of inventors, mostly unknown-a hundredmen manufacture now the stuff to provide ten thousand persons with cloth-ing for two years. In well-managed coal mines the labour of a hundred min-ers furnishes each year enough fuel to warm ten thousand families underan inclement sky. And we have lately witnessed the spectacle of wonderfulcities springing up in a few months for international exhibitions, withoutinterrupting in the slightest degree the regular work of the nations.And if in manufactures as in agriculture, and as indeed through our wholesocial system, the labour, the discoveries, and the inventions of our ancestorsprofit chiefly the few, it is none the less certain that mankind in general, aidedby the creatures of steel and iron which it already possesses, could alreadyprocure an existence of wealth and ease for every one of its members.4 PETR ALEKSEEVICH KROPOTKIN, KNIAZ As humanity masters the forces of nature and accumulates vast industrial wealth, a radical vision emerges: a worl Shipping may be from our Sydney, NSW warehouse or from our UK or US warehouse, depending on stock availability.…

Paperback. Zustand: new. Paperback. t will be noticed that the ringer and the relay coil 6 at the first station arebridged across the sides of the line leading to the central office. In likemanner the bell and the relay magnets are bridged across the two limbs ofthe line leading into each succeeding station, but this bridge at each of thestations beyond Station A is ineffective because the line extension R_{x} isopen at the next station nearest the central office.In order to ring Station A it is only necessary to send out ringing currentfrom the central office. This current is in such direction as not to cause theoperation of the relay, although it passes through the coil 6. If, on the otherhand, it is desired to ring Station B, a preliminary impulse would be sentover the metallic circuit from the central office, which impulse would be ofsuch direction as to operate the relay at Station A, but not to operate the bellat that station. The operation of the relay at Station A causes the spring 2of this relay to engage the spring 3, thus extending the line on to the secondstation. After the spring 2 at Station A has been forced into contact withthe spring 3, it is caught by the latch of the spring 5 and held mechanically.When the impulse from the central office ceases, the spring 1 resumes itsnormal position, thus breaking the bridge circuit through the bell at that3 AMERICAN SCHOOL OF CORRESPONDENCEstation. It is apparent now that the action of coil 6 at Station A has madethe relay powerless to perform any further action, and at the same time theline has been extended on to the second station. A second similar impulsefrom the central office will cause the relay at Station B to extend the line onto Station C, and at the same time break the circuit through the operatingcoil and the bell at Station B. In this way any station may be picked out bysending the proper number of impulses to operate the line relays of all thestations between the station desired and the central office, and having pickedout a station it is only necessary to send out ringing current, which currentis in such direction as to ring the bell but not to operate the relay magnet atthat station.In Fig. 197, a four-station line, such as is shown in Fig. 196, is illustrated, butthe condition shown in this is that existing when two preliminary impulseshave been sent over the line, which caused the line relays at Station A andStation B to be operated. The bell at Station C is, therefore, the only onesusceptible to ringing current from the central office.Since only one bell and one relay are in circuit at any one time, it is obviousthat all of the current that passes over the line is effective in operating a sin-gle bell or relay only. There is no splitting up of the current among a largenumber of bells as in the bridging system of operating step-by-step devices, which method sometimes so greatly reduces the effective current for eachbell that it is with great difficulty made to respond. All the energy availableis applied directly to the piece of apparatus at the time it is being operated.This has a tendency toward greater surety of action, and the adjustment ofthe various pieces of apparatus may be made with less delicacy than is re-quired where many pieces of apparatus, each having considerable work todo, must necessarily be operated in multiple.The method of unlatching the relays has been briefly referred to. After a Explore the intricate mechanics of early telecommunications through a deep dive into the electrical impulses and Shipping may be from our Sydney, NSW warehouse or from our UK or US warehouse, depending on stock availability.…

Paperback. Zustand: new. Paperback. t will be noticed that the ringer and the relay coil 6 at the first station arebridged across the sides of the line leading to the central office. In likemanner the bell and the relay magnets are bridged across the two limbs ofthe line leading into each succeeding station, but this bridge at each of thestations beyond Station A is ineffective because the line extension R_{x} isopen at the next station nearest the central office.In order to ring Station A it is only necessary to send out ringing currentfrom the central office. This current is in such direction as not to cause theoperation of the relay, although it passes through the coil 6. If, on the otherhand, it is desired to ring Station B, a preliminary impulse would be sentover the metallic circuit from the central office, which impulse would be ofsuch direction as to operate the relay at Station A, but not to operate the bellat that station. The operation of the relay at Station A causes the spring 2of this relay to engage the spring 3, thus extending the line on to the secondstation. After the spring 2 at Station A has been forced into contact withthe spring 3, it is caught by the latch of the spring 5 and held mechanically.When the impulse from the central office ceases, the spring 1 resumes itsnormal position, thus breaking the bridge circuit through the bell at that3 AMERICAN SCHOOL OF CORRESPONDENCEstation. It is apparent now that the action of coil 6 at Station A has madethe relay powerless to perform any further action, and at the same time theline has been extended on to the second station. A second similar impulsefrom the central office will cause the relay at Station B to extend the line onto Station C, and at the same time break the circuit through the operatingcoil and the bell at Station B. In this way any station may be picked out bysending the proper number of impulses to operate the line relays of all thestations between the station desired and the central office, and having pickedout a station it is only necessary to send out ringing current, which currentis in such direction as to ring the bell but not to operate the relay magnet atthat station.In Fig. 197, a four-station line, such as is shown in Fig. 196, is illustrated, butthe condition shown in this is that existing when two preliminary impulseshave been sent over the line, which caused the line relays at Station A andStation B to be operated. The bell at Station C is, therefore, the only onesusceptible to ringing current from the central office.Since only one bell and one relay are in circuit at any one time, it is obviousthat all of the current that passes over the line is effective in operating a sin-gle bell or relay only. There is no splitting up of the current among a largenumber of bells as in the bridging system of operating step-by-step devices, which method sometimes so greatly reduces the effective current for eachbell that it is with great difficulty made to respond. All the energy availableis applied directly to the piece of apparatus at the time it is being operated.This has a tendency toward greater surety of action, and the adjustment ofthe various pieces of apparatus may be made with less delicacy than is re-quired where many pieces of apparatus, each having considerable work todo, must necessarily be operated in multiple.The method of unlatching the relays has been briefly referred to. After a Explore the intricate mechanics of early telecommunications through a deep dive into the electrical impulses and Shipping may be from our UK warehouse or from our Australian or US warehouses, depending on stock availability.…

Paperback. Zustand: new. Paperback. . A machine is a combination of timbers fastened together, chiefly effica-cious in moving great weights. Such a machine is set in motion on sci-entific principles in circular rounds, which the Greeks call [Greek: kyklikekineois]. There is, however, a class intended for climbing, termed in Greek[Greek: akrobatikon], another worked by air, which with them is called[Greek: pneumatikon], and a third for hoisting; this the Greeks named[Greek: baroulkos]. In the climbing class are machines so disposed that onecan safely climb up high, by means of timbers set up on end and connectedby crossbeams, in order to view operations. In the pneumatic class, air isforced by pressure to produce sounds and tones as in an [Greek: organon].2. In the hoisting class, heavy weights are removed by machines which raisethem up and set them in position. The climbing machine displays no scien-tific principle, but merely a spirit of daring. It is held together by dowels andcrossbeams and twisted lashings and supporting props. A machine that getsits motive power by pneumatic pressure will produce pretty effects by scien-tific refinements. But the hoisting machine has opportunities for usefulness3 VITRUVIUS POLLIOwhich are greater and full of grandeur, and it is of the highest efficacy whenused with intelligence.3. Some of these act on the principle of the [Greek: mechane], others on thatof the [Greek: organon]. The difference between "machines" and "engines"is obviously this, that machines need more workmen and greater power tomake them take effect, as for instance ballistae and the beams of presses. En-gines, on the other hand, accomplish their purpose at the intelligent touch ofa single workman, as the scorpio or anisocycli when they are turned. There-fore engines, as well as machines, are, in principle, practical necessities, with-out which nothing can be unattended with difficulties.4. All machinery is derived from nature, and is founded on the teachingand instruction of the revolution of the firmament. Let us but consider theconnected revolutions of the sun, the moon, and the five planets, withoutthe revolution of which, due to mechanism, we should not have had thealternation of day and night, nor the ripening of fruits. Thus, when our an-cestors had seen that this was so, they took their models from nature, andby imitating them were led on by divine facts, until they perfected the con-trivances which are so serviceable in our life. Some things, with a view togreater convenience, they worked out by means of machines and their revo-lutions, others by means of engines, and so, whatever they found to be usefulfor investigations, for the arts, and for established practices, they took careto improve step by step on scientific principles.5. Let us take first a necessary invention, such as clothing, and see how thecombination of warp and woof on the loom, which does its work on theprinciple of an engine, not only protects the body by covering it, but alsogives it honourable apparel. We should not have had food in abundanceunless yokes and ploughs for oxen, and for all draught animals, had been in-vented. If there had been no provision of windlasses, pressbeams, and leversfor presses, we could not have had the shining oil, nor the fruit of the vine togive us pleasure, and these things could not be transported on land withoutthe invention of the mechanism of carts or waggons, nor on the sea Explore the divine me Shipping may be from our UK warehouse or from our Australian or US warehouses, depending on stock availability.…

Paperback. Zustand: new. Paperback. IThe human race has travelled a long way, since those remote ages when menfashioned their rude implements of flint and lived on the precarious spoilsof hunting, leaving to their children for their only heritage a shelter beneaththe rocks, some poor utensils-and Nature, vast, unknown, and terrific, withwhom they had to fight for their wretched existence.During the long succession of agitated ageswhich have elapsed since, mankindhas nevertheless amassed untold treasures. It has cleared the land, dried themarshes, hewn down forests, made roads, pierced mountains; it has beenbuilding, inventing, observing, reasoning; it has created a complex machin-ery, wrested her secrets from Nature, and finally it pressed steam and electric-ity into its service. And the result is, that now the child of the civilized manfinds at its birth, ready for its use, an immense capital accumulated by thosewho have gone before him. And this capital enables man to acquire, merelyby his own labour combined with the labour of others, riches surpassing thedreams of the fairy tales of the Thousand and One Nights.3 PETR ALEKSEEVICH KROPOTKIN, KNIAZThe soil is cleared to a great extent, fit for the reception of the best seeds, ready to give a rich return for the skill and labour spent upon it-a returnmore than sufficient for all the wants of humanity. The methods of rationalcultivation are known.On the wide prairies of America each hundred men, with the aid of pow-erful machinery, can produce in a few months enough wheat to maintainten thousand people for a whole year. And where man wishes to double hisproduce, to treble it, to multiply it a hundred-fold, he makes the soil, givesto each plant the requisite care, and thus obtains enormous returns. Whilethe hunter of old had to scour fifty or sixty square miles to find food for hisfamily, the civilized man supports his household, with far less pains, and farmore certainty, on a thousandth part of that space. Climate is no longer anobstacle. When the sun fails, man replaces it by artificial heat; and we seethe coming of a time when artificial light also will be used to stimulate veg-etation. Meanwhile, by the use of glass and hot water pipes, man rendersa given space ten and fifty times more productive than it was in its naturalstate.The prodigies accomplished in industry are still more striking. With theco-operation of those intelligent beings, modern machines-themselves thefruit of three or four generations of inventors, mostly unknown-a hundredmen manufacture now the stuff to provide ten thousand persons with cloth-ing for two years. In well-managed coal mines the labour of a hundred min-ers furnishes each year enough fuel to warm ten thousand families underan inclement sky. And we have lately witnessed the spectacle of wonderfulcities springing up in a few months for international exhibitions, withoutinterrupting in the slightest degree the regular work of the nations.And if in manufactures as in agriculture, and as indeed through our wholesocial system, the labour, the discoveries, and the inventions of our ancestorsprofit chiefly the few, it is none the less certain that mankind in general, aidedby the creatures of steel and iron which it already possesses, could alreadyprocure an existence of wealth and ease for every one of its members.4 PETR ALEKSEEVICH KROPOTKIN, KNIAZ As humanity masters the forces of nature and accumulates vast industrial wealth, a radical vision emerges: a worl Shipping may be from our UK warehouse or from our Australian or US warehouses, depending on stock availability.…

Paperback. Zustand: new. Paperback. BY CAPE SPARTELOver the meadows that blossom and wither Rings but the note of a sea-bird's song, Only the sun and the rain come hither All year long.The Deserted Garden.Before us the Atlantic rolls to the verge of the "tideless, dolorous inland sea."In the little bay lying between Morocco's solitary lighthouse and the famousCaves of Spartel, the waters shine in colours that recall in turn the emerald, the sapphire, and the opal. There is just enough breeze to raise a fine spray asthe baby waves reach the rocks, and to fill the sails of one or two tiny vesselsspeeding toward the coast of Spain. There is just enough sun to warm thewater in the pools to a point that makes bathing the most desirable mid-daypastime, and over land and sea a solemn sense of peace is brooding. Fromwhere the tents are set no other human habitation is in sight. A great spurof rock, with the green and scarlet of cactus sprawling over it at will, shutsoff lighthouse and telegraph station, while the towering hills above hide thevillage of Mediunah, whence our supplies are brought each day at dawn andsun-setting.3 S. L. (SAMUEL LEVY) BENSUSANTwo fishermen, clinging to the steep side of the rock, cast their lines intothe water. They are from the hills, and as far removed from our twentiethcentury as their prototypes who were fishing in the sparkling blue not so veryfar away when, the world being young, Theocritus passed and gave themimmortality. In the valley to the right, the atmosphere of the Sicilian Idylls ispreserved by two half-clad goatherdswho have brought their flock to pasturefrom hillside Mediunah, in whose pens they are kept safe from thieves atnight. As though he were a reincarnation of Daphnis or Menalcas, one ofthe brown-skinned boys leans over a little promontory and plays a tunelessghaitah, while his companion, a younger lad, gives his eyes to the flock andhis ears to the music. The last rains of this favoured land's brief winter havepassed; beyond the plateau the sun has called flowers to life in every nook andcranny. Soon the light will grow too strong and blinding, the flowers willfade beneath it, the shepherds will seek the shade, but in these glad Marchdays there is no suggestion of the intolerable heat to come.On the plot of level ground that Nature herself has set in position for a camp, the tents are pitched. Two hold the impedimenta of travel; in the third Salamand his assistant work in leisurely fashion, as befits the time and place. Tang-ier lies no more than twelve miles away, over a road that must be deemed un-commonly good for Morocco, but I have chosen to live in camp for a weekor two in this remote place, in preparation for a journey to the southerncountry. At first the tents were the cynosure of native eyes. Mediunah camedown from its fastness among the hilltops to investigate discreetly from se-cure corners, prepared for flight so soon as occasion demanded it, if not be-fore. Happily Salam's keen glance pierced the cover of the advance-guardand reassured one and all. Confidence established, the village agreed aftermuch solemn debate to supply eggs, chickens, milk, and vegetables at prices An explorer seeks solitude in a remote coastal camp, finding peace amidst shimmering waters and timeless pastoral scenes before embarking on a journey into the deep desert. This item is printed on demand. Shipping may be from multiple locations in the US or from the UK, depending on stock availability.…

Paperback. Zustand: new. Paperback. IWith what a valiant and unyielding spirit our forefathers met the unspeak-able hardships of the first days of American colonization! We of these softerand more abundant times can never quite comprehend what distress, whatpositive suffering those bold souls of the seventeenth century endured to es-tablish a new people among the nations of the world. The very voyage fromEngland to America might have daunted the bravest of spirits. Note butthis glimpse from an account by Colonel Norwood in his Voyage to Virginia: "Women and children made dismal cries and grievous complaints. The in-finite number of rats that all the voyage had been our plague, we now wereglad to make our prey to feed on; and as they were insnared and taken a wellgrown rat was sold for sixteen shillings as a market rate. Nay, before the voy-age did end (as I was credibly informed) a woman great with child offeredtwenty shillings for a rat, which the proprietor refusing, the woman died."3 CARL HOLLIDAYThat was an era of restless, adventurous spirits-men and women filled withthe rich and danger-loving blood of the Elizabethan day. We should recallthat every colony of the original thirteen, except Georgia, was founded in theseventeenth century when the energy of that great and versatile period of theVirgin Queen had not yet dissipated itself. The spirit that moved Ben Jon-son and Shakespeare to undertake the new and untried in literature was thesame spirit that moved John Smith and his cavaliers to invade the Virginiawilderness, and the Pilgrim Fathers to found a commonwealth for freedom'ssake on a stern and rock-bound coast. It was the day of Milton, Dryden, andBunyan, the day of the Protectorate with its fanatical defenders, the day ofthe rise and fall of British Puritanism, the day of the Revolution of 1688which forever doomed the theory of the divine rights of monarchs, the dayof the bloody Thirty Years' War with its consequent downfall of aristocracy, the day of the Grand Monarch in France with its accumulating preparationsfor the destruction of kingly lights and the rise of the Commons.In such an age we can but expect bold adventures. The discovery and ex-ploration of the New World and the defeat of the Spanish Armada had nowmade England monarch of sea and land. The imagination of the people wasaroused, and tales of a wealth like that of Croesus came from mariners whohad sailed the seven seas, and were willingly believed by an excited audience.Indeed the nations stood ready with open-mouthed wonder to accept allstories, no matter how marvelous or preposterous. America suddenly ap-peared to all people as the land that offered wealth, religious and politicalfreedom, a home for the poor, a refuge for the persecuted, in truth, a par-adise for all who would begin life anew. With such a vision and with such aspirit many came. The same energy that created a Lear and a Hamlet createda Jamestown and a Plymouth. Shakespeare was at the height of his careerwhen Jamestown was settled, and had been dead less than five years whenthe Puritans landed at Plymouth. Impelled by the soul of such a day Puri-tan and Cavalier sought the new land, hoping to find there that which they Witness the harrowing grit and unyielding courage of the pioneers who braved starvation and sea voyages to forge a new world from the wilderness. This item is printed on demand. Shipping may be from multiple locations in the US or from the UK, depending on stock availability.…