Elementary Lessons in Heat

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J.B. Lippincott, 1889 - Heat - 160 pages
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Page 84 - In general, the plane determined by an incident ray and the normal to the surface at the point of incidence is called the plane of incidence.
Page 100 - It is hardly necessary to add, that anything which any insulated body, or system of bodies, can continue to furnish without limitation, cannot possibly be a material substance ; and it appears to me to be extremely difficult, if not quite impossible, to form any distinct idea of anything capable of being excited and communicated in the manner the Heat was excited and communicated in these experiments, except it be MOTION.
Page 126 - On either side of this zone and converging toward it are the trade winds, which blow from the northeast in the Northern Hemisphere and from the southeast in the Southern Hemisphere. The...
Page 84 - This theory asserts that all bodies are constantly giving out radiant heat, at a rate depending upon their substance and temperature, but independent of the substance or temperature of the bodies which surround them ; x and that, when a body is kept at a uniform temperature, it receives back just as much heat as it gives out.
Page 38 - 087 feet Hence the work developed during an entire stroke is "087 xp foot-pounds. Now this is developed by the descent from 0 to — t" of the quantity of heat necessary to melt a cubic foot of ice ; that is, by 4925 thermic units, the unit being the quantity of heat required to raise a pound of water from 0 to 1* centigrade.
Page 60 - Explanation of Table II. 38. The calculation of the mechanical effect, in any case, which might always be effected in the manner described in 37 * The part of this expression in the first vinculum (see Regnault, end of ninth Memoire) is what is known as "the total heat...
Page 127 - TF/-\/sin <PThe total transport due to the wind drift is directed at right angles to the wind, in the Northern Hemisphere to the right and in the Southern Hemisphere to the left.
Page 63 - ... under the receiver of an air-pump. As the air is exhausted, the...
Page 84 - ... incident ray is called the plane of incidence. With this explanation we proceed to give the laws of the reflection of heat: — 1. When a ray of heat is reflected by a surface, the line of reflection lies in the plane of incidence. 2. The angle of reflection is equal to the angle of incidence ; that is, the reflected and incident rays make equal angles with the normal to the surface at the point of incidence. We shall see hereafter that these laws are precisely the same as those of the reflection...
Page 102 - British thermal unit (B. tu) is the quantity of heat necessary to raise the temperature of 1 pound of water (not ice) 1 F.

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