Physics, Experimental and Theoretical; Mechanics, Hydrostatics, Pneumatics, Heat, and Acoustics Volume 1

Physics, Experimental and Theoretical; Mechanics, Hydrostatics, Pneumatics, Heat, and Acoustics Volume 1

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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. 1899 edition. Excerpt: ...0, is advancing along the body. If the body were coated with wax (meltingpoint 54 C?.), the line of demarcation of the solid and molten wax would be always 54 C., and the rate of melting would be a visible indication of the march of the 54 equithermal, while when the wax ceased to melt we should know that all that portion of the body between the hot end and the line of demarcation had attained the stationary state. If on the body there were placed a bit of phosphorus (ignition point 43 C.), its taking fire would be evidence of the 43 equithermal having reached it; while if it were placed so far from the hot end that this particular equithermal came to a halt before reaching it, it would never take fire at all. The rate of march of an equithermal of temperature 0 along a body is sometimes spoken of as the "rate of flow of the temperature 0" a phrase somewhat confusing. The so-called "flow of temperature" is of an essentially different nature from a How of heat. The former is the bodily progress of a geometrical surface, and its rate is a velocity--so many feet per second But when we speak of the rate of flow of heat ( 472), we make no reference to the velocity of the heat; what we mean is a certain quantity--so many therms--per second. Heat-flow is thus rather analogous to a water-current, for we measure the current in a pipe, not by the velocity of the water, but by the quantity of it delivered per second. It should be here noted that the rate of march of an equithermal surface does not depend simply upon the conductivity of the body: it is for this reason that, in the experiment of Fig. 220, the quickness with which the balls fall off on the two rods affords no reliable evidence as to the relative conductivities of the...show more

Product details

  • Paperback | 398 pages
  • 189 x 246 x 21mm | 708g
  • Rarebooksclub.com
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236624785
  • 9781236624789