American horological journal, devoted to practical horology (1869)
Miller, George B · New York, G. B. Miller · leaf 204
rward andattached to the other pole of the battery,forming a complete circuit without groundconnection. A break-circuit key is placedon the wire at each instrument, within con-venient reach of the observer. The galvanic current is .momentarily interrupted by theaction of the clock at every second… … At a a, is shown a steel spring, six inchesin length, terminating at 6 in a platinumpoint. This spring is bent at 6, so as to forma double inclined plane, the angle at c being80*^ nearly. One end of this spring is securedto a plate which is screwed fast to the back-board of the sidereal clock. At h…
Clocks and watches
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