Light visible and invisible : a series of lectures delivered at the Royal Institution of Great Britain, at Christmas, 1896 (1897)
Thompson, Silvanus Phillips, 1851-1916, Royal Institution of Great Britain · New York : Macmillan · leaf 223
been gilt with gold-leaf. I amgoing to put the beaker of hot water exactly in the middlebetween the two bulbs, where it can radiate equally toboth of them. The gilt bulb, having a bright surface,reflects the waves, and is scarcely warmed at all bythem. But the black bulb, having a more… … Fig. hi. THE INVISIBLE SPECTRIN! 203 could have readily demonstrated another point, namely,that a hot black surface radiates out the heat-wavesmore readily than a hot bright surface does. Now let us pass on to another experiment in whichwe again employ the thermopile. Here is a thermopileconnected…
Light · X-rays
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