Dynamo-electricity: its generation, application, transmission, storage and measurement (1884)
Prescott, George B. (George Bartlett), 1830-1894 · New York, D. Appleton · leaf 200
aratus is enveloped in a cylindrical cover piercedwith holes to allow of the escape of heat, and surmounted by alamp which indicates to the eye the desired degree of luminosity.It is worked by a disk, shown separately in the lower part ofFig. 102, and which can be turned so as to bring a contact… … Fig. 100. lighting galleries in mines. In this arrangement, represented inFig. 104, the lamp is introduced in a glass receptacle filled withwater and held in suspension. Communication of the appara-tus with the circuit is arranged in such a way that the points ofcontact are covered by water, which…
Electrical engineering
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