ntrolled bythe spiral spring S. Two fans, F F, attached to the vaneand inclosed in the damping boxes D B make the instru-ment dead beat. These voltmeters range from 750 to1,400 volts, and from 1;400 to 2;800 volts, INSTRUMENTS. Ill The advantages of this type of instruments for switch-board use… … Fig. 54. While the use of static instruments is in most respectsfar preferable to that of electromagnetic instruments onhigh tension service, the former are open to one seriousobjection, and that is the tendency of the parts to dischargeacross the air gap between them, giving rise to sparks det-…
Electronics · Electricity
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