Journal - Franklin Institute of the State of Pennsylvania (1826)
Franklin Institute, Philadelphia, Franklin Institute (Philadelphia, Pa.) · [Philadelphia : Franklin Institute] · leaf 69
ies and when closed short-circuit the coilsof the two electromagnets. When the contact of relay Ri is openedby operating the armature manually or by means of the remotecontrol circuit the contact of relay R2 also opens and is held openuntil the contact C is opened. The relay Rn is provided with… … Film clamping device. Film clamped. magnets in lieu of opening the power circuit as a means of de-energizing them. As soon as C opens, the contact of relay R2closes (the contact of R^ already being closed), and the short-circuit across the electromagnets is restored. The manner of clamping the film…
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