Davis's manual of magnetism : including galvanism, magnetism, electro-magnetism, electro-dynamics, magneto-electricity, and thermo-electricity (1854)
Davis, Daniel · Boston : Palmer and Hall · leaf 218
ive construction is placedat the end of the telegraphic line, which moves anarmature by the galvanic power, sufficiently onlyto make contact between a platinum point and sur-face, which are in the circuit of another small bat-tery, immediately on the spot. This at once worksthe registering… … duction, renders it difficult, with a moderate sizedbattery, to explode the charge by heating a wire ata considerable distance. In the arrangement heredescribed, the receiving apparatus is used to completethe circuit of a small battery in a protected positionnear the place where the explosion is to…
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