Sinossi
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. 1920 Excerpt: ...the fact that the conductivity of this brick wall is considerably greater than the conductivity given for a brick wall in the table in Art. 38? 71. A steam pipe of which the outside diameter is 2 inches is covered with a cylinder of asbestos and magnesia cement. The pipe is at 23o F. and the outside of the covering is at 8o F. Find the loss of heat in 24 hours by 100 feet of the pipe. 72. With given inside and outside temperatures the heat flow through a pipe covering Of given length made of given material depends only on the ratio of inside and outside diameters of the covering, according to equation (14). If a 2 inch pipe has a covering 45 inches in diameter what outside diameter of covering would give the same heat loss per 100 feet on a one inch pipe? Sizes of pipes as here given refer to outside diameters. 73. Derive an expression for the temperature difference be S tween inside and outside of a spherical shell of conductivity k when h gram-calories per second flows through the shell, using Ri for inside radius and i?2 for outside radius of shell. 41. Component parts of radiant heat. A beam of white light (of sunlight) is separated into its component parts (colors) when it is passed through a prism, and each component part is light of a definite wave-length. That is to say, sunlight is a mixture of various wave-lengths (colors), and the band of colors which is formed by a prism and as seen in a spectroscope is called the spectrum. The spectrum of sunlight contains invisible, longwave-length rays beyond the red end of the spectrum in what is called the infra-red, and invisible, short-wave-length rays beyond the violet end of the spectrum in what is called the ultra-violet. The radiation from any hot body is, like sunlight, a mixture of all wave-lengths....
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