Text-book of general physics, for the use of colleges and scientific schools (1899)
Hastings, Charles Sheldon · Boston: Ginn & company · leaf 459
various bodies. For the production ofcurrents sufficient for many laboratory purposes, the piletakes the cylindrical form (Fig. 284). which is built up ofa number of rings, each containing ten couples made of ironand an antimony-zinc alloy, properly supported and insulated.The interior junctions,… … Fig. 2S4. of about 8 volts and have a resistance of about 3 ohms.As a current generator the thermopile is but little used, forthe E.M.F. is small and unsteady. 406. Radio-Micrometer. —A very sensitive instrument fordetecting absorbed radiations, first devised by dArsonval,but independently invented…
Physics
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