Tyndall, John, 1820-1893 · New York, D. Appleton · leaf 348
d toaccount by another: how science grows by the continualsubjugation of ends to means. Had not Melloni discoveredthe diathermic properties of rock-salt, we should now be DBOT xrt. RADIATION THROUGH AIR. 323 utterly at a loss. For a time, however, the difficulty ofobtaining plates of salt… … parent plates of this precious substance, which, by meansof the caps a and b, can be screwed air-tight on to theends of the cylinder.1 The cylinder is provided with two 1 At a time when I was greatly in need of a supply of rock-salt, I statedmy wants in the Philosophical Magazine, and met with an…
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