Theory and practice of the electric telegraph; a manual for operators and students (1875)
Churchill, Charles Henry, d. 1904. [from old catalog] · Oberlin, Ohio, Sherman & bros. · leaf 156
in Fig. 66, and the outsideplates, one of antimony and the other of bismuth terminateeach in a wire, on applying a gentle heat to one end of thebundle, a current of electricity is at once set in motionfrom one metal to the other. Fis- 67. A compact bundle of such plates is seen at Tin Fig. 61], and…
Telegraph
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