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. 1891 Excerpt: ...1. By conduction to the cooler part next to it. 2. By radiation. 3. By contact with the cooler air. Experiment 3.--To convince yourself of the loss by radiation. Instructions.--You have only to take the wire out of the flame, and hold the palm of your hand below it, and close to it, to feel the heat radiated. ...
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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. 1891 Excerpt: ...1. By conduction to the cooler part next to it. 2. By radiation. 3. By contact with the cooler air. Experiment 3.--To convince yourself of the loss by radiation. Instructions.--You have only to take the wire out of the flame, and hold the palm of your hand below it, and close to it, to feel the heat radiated. Experiment 4.--To convince yourself of the loss of heat to the air. Instructions.--Hold the palm of your hand above it, and you will receive, in addition to the heat radiated, that brought by the ascending current of air that has become warmed by contact with it; it will seem hotter. It is evident, therefore, that every part of the wire is losing heat, and therefore, since its temperature does not fall, it must be receiving heat by conduction from the hot parts next to it towards the flame, and similarly it must lose heat to the cold part next to it away from the flame. So that we see that the heat of the flame is still being conducted away by the wire, though the temperature of the wire does not alter. Experiment 5.--To compare the conductivity of copper with that of iron. Instructions.--Take a similar wire of each metal, say size No. 21, and about 10 or 15 cm. long; hold the end of each together in the flame, one in each hand, not in the hottest part, where the copper would melt, but near the top; you will find that the remote end of the copper gets hot by conduction soonest, also that when the stationary stage is reached for each the copper is much hotter than the iron in corresponding parts. But the hotter a thing is the quicker does it lose its heat by radiation (see page 163), therefore the cool end of the copper is losing heat quicker than the still cooler end of the iron, and consequently (since its temperature remains fixed) it must be gaining...
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Near Fine. No Jacket. 16mo-over 5¾"-6¾" tall. Third Edition. 308 pp. Illustrated. Very light wear to the extremities. The endpapers and the edges have spots of foxing. There is faint erasure on the front free endpaper. Otherwise fine in a square, tight binding with hinges intact.
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