Inhaltsangabe
This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1866. Excerpt: ... Doctor, "which treat of the laws regulating the rest and the motion of liquids, are hydrostatics and hydraulics. We shall first consider the leading principles of the former of these branches of the subject. It will be convenient if we first consider what a liquid is. Can you, Albert, from our former conversation, give me a definition?" "A liquid state," said Albert, "is that in which the constituent particles of the body do not manifest cohesion or repulsion; they do not cohere like the particles of a solid; they are separated by the slightest force; they move amongst each other without friction." "You have given a very accurate definition," said the Doctor," and one which it is obvious is equally applicable to all liquids, and points out the distinction between solids and liquids, such as spirits, oils, water, quicksilver, &c. Upon the properties you mention, depends the level surface which liquids, when at rest, always present. If I dig up a spadeful of earth, if I excavate a portion of the surface of a rock, or cut a piece of wood out of the surface of the plank on which you are now standing, the adjacent parts remain as they were. But if I take up from the surface of a liquid, a portion of it, the adjacent particles instantly flow in and occupy the place of those taken away, and the surface remains level as before. The first law we shall consider is, that liquids maintain their level. Of this I shall now fur-Fig. 40. nish you with some illustrations. "Example 1. Here is a vessel of water. If I take this glass tube (fig. 46) and stop one end it c with my finger, and plunge the other end a into the water, the water does not at first rise in it beyond a very short space; but whenever I remove my finger from the upper end of it, the water ascends to the ...
Die Inhaltsangabe kann sich auf eine andere Ausgabe dieses Titels beziehen.
