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. 1894 Excerpt: ...use. When this is done, usually a flash is seen. Moreover, the switch may so be held that an arc is maintained between the moving tongue or contact piece and the fixed contact piece. But allowing it to be opened quickly, even by the means of some spring snap arrangement, the opening will still take a very appreciable amount of time compared to the extremely small period required for the spark. "No switch could endure, whereof the moving parts moved with a speed even approaching that of a flying bullet. The upshot, hence, in the case of a flash seen at the opening of a switch, is that, whereas this may have for its commencement a self-induction disruptive spark of our third (or fifth) order, the remainder of the flash will be a momentary arc due to the current; and the greater the current, the greater will be the deflagration. This point of the brilliancy of the flash, or the deflagration, depending on the quantity of the current, and also that of the intensity of the shock depending on the E.M.F., may be found fully discussed in the earlier part of Chapter IV. of Prof. J. A. Fleming's book on " The Alternate Current Transformer," Vol. I. L Now we found when examining the arc between two carbonsr that the precursory spark volatilised some particles of carbon; that is, heated them so intensely as to turn them to gas. Further, we noted that on the establishment of the arc both carbons were burnt, owing to their oxidisation in the air; but the positive carbon at twice the rate of the negative. Now,, metals will volatilise more easily than carbon; and moreover, they also oxidise when heated and exposed to the air, even when not fused. Hence, in the case of the flash seen with the switch, and drawing our inference from the arc between two carbons, ...
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Reseña del editor
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. 1894 Excerpt: ...use. When this is done, usually a flash is seen. Moreover, the switch may so be held that an arc is maintained between the moving tongue or contact piece and the fixed contact piece. But allowing it to be opened quickly, even by the means of some spring snap arrangement, the opening will still take a very appreciable amount of time compared to the extremely small period required for the spark. "No switch could endure, whereof the moving parts moved with a speed even approaching that of a flying bullet. The upshot, hence, in the case of a flash seen at the opening of a switch, is that, whereas this may have for its commencement a self-induction disruptive spark of our third (or fifth) order, the remainder of the flash will be a momentary arc due to the current; and the greater the current, the greater will be the deflagration. This point of the brilliancy of the flash, or the deflagration, depending on the quantity of the current, and also that of the intensity of the shock depending on the E.M.F., may be found fully discussed in the earlier part of Chapter IV. of Prof. J. A. Fleming's book on " The Alternate Current Transformer," Vol. I. L Now we found when examining the arc between two carbonsr that the precursory spark volatilised some particles of carbon; that is, heated them so intensely as to turn them to gas. Further, we noted that on the establishment of the arc both carbons were burnt, owing to their oxidisation in the air; but the positive carbon at twice the rate of the negative. Now,, metals will volatilise more easily than carbon; and moreover, they also oxidise when heated and exposed to the air, even when not fused. Hence, in the case of the flash seen with the switch, and drawing our inference from the arc between two carbons, ...
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