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)
own in the figure. Polished brass possesses the highest reflecting power; silver reflectsnine-tenths, tin eight-tenths, glass one-tenth as much as brass. Platesblackened by smoke do not reflect heat at all. HEAT. 173 295. Figure 22.—Absorptive pow^er.—As previously stated,different substances… … Let the source of heat be a canister, F, of boiling water; bring thethermal rays to a focus by means of the parabolic mirrot, E, as repre-sented. In the focus place the bulb of the differential thermometer,successively covered with the different substances to be tested. Substances blackened with…
Physics · Astronomy
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