and are placedopposite to each other at some 50 or 60 cm. apart. Betweenthe plates a source of radiation such as the hot copper ball, ora gas jet, is ^placed. A thermo-electric junction is formed bythe contact of the bismuth and the tinned iron, and if thejunctions on the two sheets be unequally… … Fig. 79. order that no current may be produced the source must bevery considerably nearer the bright sheet. The blackenedsurface absorbs a much greater proportion of the incidentradiation th.an the bright, and by measuring the distances ofthe ball from the surfaces when there is no current,…
Heat · Light
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