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 219
raph in which the axial force is used, motion being obtained inthe manner described in<§> 289. This is introduc-ed as a new instrument,and its originality is hereclaimed. Two uprightcoils, C, are supported ashort distance above thebaseboard. Entering these from below is a U-shapedrod of soft… … CLOCK-WORK AXIAL TELEGRAPH. 203 sensitive. A grooved roller, for carrying the paper,is seen above the coils. To the iron bar is attacheda blunt point, so as to project above its poles, in thecentre, and in opposition to the groove on the roller.Contact being made with the battery, the soft…
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