: Is radiation capa- In 1821, Seebeck, of Berlin, discovered that heat appliea to ble of diffusing heat? Throwing the image of the carbon the junction of two metals of unequal heat-conducting power, points on the screen, as in Fig. 1, he showed that ordinary soldered together at one end,the other… … verge to a focus by the aid of a concave mirror in the appa- nometer. With this instrument, we may discover the seat astonished all observers by its ability to tow great ships of ratus shown in Fig. 2. Ais the mirror from which the re- and intensity of the rays of heatin the spectrum. This is many…
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