s arms pressed constantly upon E in position todrop. The wiring of the magnets is shown in Fig. 130. The upper contact (carried in F) is a piece of platinumwith its lower edge cut at an angle of fifteen degrees andbeveled to a knife-edge. The lower point of this bevelcomes into contact first and is… … Fig. 134 narily there is very little corrosion from burning and this isconstantly rubbed off by the sliding of the surfaces uponeach other. The lower contact, G, consists of a brass blockmounted upon an insulating plate of hard rubber. Theblock is in two pieces, screwed together, and each…
Clocks and watches
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