Johnson's natural philosophy and key to philosophical charts : illustrated with 500 cuts; being reduced photographic copies of all the diagrams contained in the author's philosophical series of indestructible school charts ; for the use of schools and families (1878)
through which the heat has beenpreviously transmitted. HEAT. 175 300. Diathermancy of the air.—The atmosphere is very dia-thermauic. If it -were not, the iii)per layers would be much heated bythe solar rays passing through them; and the earth would receivecorrespondingly less heat from the sun.… … glass; which consists of a double convex lens. By such a lens therays of heat, not only of the sun but other heated bodies, are concen-trated and brought to a focus, same as rays of light. Glass lenses areused for condensing the heat of the sun, but they will not condense theheat from other…
Physics · Astronomy
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