Tyndall, John, 1820-1893 · New York, D. Appleton · leaf 323
, and, keeping it at a constant distancefrom the thermo-pile, p, allow its four faces to radiate,in succession, against the pile. The hot gold surfaceproduces scarcely any deflection ; the hot silver is equallyinoperative; the same is the case with the copper; butwhen the varnished surface is… … agitated by heat, communicate more motion to the etherthan do the atoms of the metals; in other words, thevarnish is a better radiator than the metals are. A similarresult is obtained when a silver teapot is compared withan earthenware one. Both being filled with boiling water,the silver produces…
Heat
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