Cumming, Linnæus, b. 1843. [from old catalog] · New York, D. Van Nostrand · leaf 388
Fig. 239. sistance. The cone of polished metal attached is useful inexperiments on radiant heat to limit the area from which theradiations proceed on to the face of the thermopile. The … Fig. 240. metals employed in the thermopile are usually bismuth andantimony, which of all the more common metals give the 2 A 370 Electricity. [Book iv. highest E.M.F. at ordinary temperatures, though a couple ofbismuth and tellurium would be of much higher power. With a good thermopile a…
Electricity
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