. The principles of physics. Fig. 473 represents suchan arrangement. The light bars are. bismuth,and the dark ones antimony. If the source ofheat be strong and near, one face may be heatedmuch hotter than the other, and a current equalto that from an ordinary galvanic cell is oftenobtained. Such contrivances for generatingelectric currents are calledthermo-electric batteries. Theyare seldom used, inasmuch asthe best of them transform less than one,-,,^^_5^_^j. per cent of the heat energy given out byS^j 1^9^^ the source of heat. Furthermore, thei__J |]^jp of thermic piles is generally s
. The principles of physics. Fig. 473 represents suchan arrangement. The light bars are. bismuth,and the dark ones antimony. If the source ofheat be strong and near, one face may be heatedmuch hotter than the other, and a current equalto that from an ordinary galvanic cell is oftenobtained. Such contrivances for generatingelectric currents are calledthermo-electric batteries. Theyare seldom used, inasmuch asthe best of them transform less than one,-,,^^_5^_^j. per cent of the heat energy given out byS^j 1^9^^ the source of heat. Furthermore, thei__J |]^jp of thermic piles is generally sosmall that any considerable external re-sistance makes the current extremely the source of heat be feeble or distant,the feeble current may serve to measure the difference of tem-perature between the ends of the bars turned toward the heatand the other ends, which are at the temperature of the apparatus, when used for this purpose, is called a thermo-pile or thermo-multiplier. A combination (Fig. 474) of as.
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectphysics, bookyear1895
