Dynamo-electricity: its generation, application, transmission, storage and measurement (1884)
Prescott, George B. (George Bartlett), 1830-1894 · New York, D. Appleton · leaf 197
Fig. 96. edges contact with and close circuit between the two pins beforenoted. Upon the socket within the ring a spring pawl is fastened,taking into recesses cut upon the interior of the ring, so as tolimit the movement of the ring upon the socket and also indi- … Fig. 91. cate, by the click of the pawl passing into a recess, when thenecessary amount of movement has been given. By this ar-rangement a reliable circuit controller is furnished, which maybe placed at the lamp itself, or in exposed situations, withoutdanger of accidental manipulation or breakage.…
Electrical engineering
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