International Library of Technology · Scranton, International Textbook Co. · leaf 332
ubber atsome distance from each other. Plates b, b are connected 40 ELECTRIC LIGHTING. §17 to the lines. When no grounds are present, 1 and J,., 2 and 3become oppositely charged by reason of charges induced onplates a, a by plates b, b. The forces acting on the vane Vare, therefore, equal and… … Fig. 42. thus giving a deflection. If A becomes grounded, a deflectionin the opposite direction is obtained. Instruments of thiskind can, of course, only be used in places where the pressureis fairly high, as the electrostatic forces produced by chargesdue to low pressures would not be large enough…
Electrical engineering
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