Discoveries and inventions of the nineteenth century (1905)
Routledge, Robert · London : G. Routledge and Sons · leaf 619
I.— The Step-by-stepMoiiement. … Fig. 290.—Fro}tte7ifs Dials. these movements and pauses the hand on the indicator will accuratelyrepeat, and the reason of this may be seen by observing that the battery-contacts are made by the projections on the metallic wheel, R, which turn 568 THE ELECTRIC TELEGRAPH. with the index. The spring,…
Inventions
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