. Electric railway journal . MOVING ELEMENT OF ALTERNATING-CURRENT SWITCHBOARD METER,SHOWING FIELD ANDMOVABLE COILS. DIRECT-CURRENT SWITCHBOARD METER OF HORIZONTALEDGEWISE TYPE gives the wattmeters a uniformly spaced scale and thevoltmeters and ammeters a scale which advances uni-formly with the square of the current. Horizontal edgewise patterns and round patterns aredesigned for switchboard work. The alternating-cur-rent type contains a dynamometer movement made upof a fixed field coil and a moving coil as the illustration on this page shows. The direct-current type, which isshown in another
. Electric railway journal . MOVING ELEMENT OF ALTERNATING-CURRENT SWITCHBOARD METER,SHOWING FIELD ANDMOVABLE COILS. DIRECT-CURRENT SWITCHBOARD METER OF HORIZONTALEDGEWISE TYPE gives the wattmeters a uniformly spaced scale and thevoltmeters and ammeters a scale which advances uni-formly with the square of the current. Horizontal edgewise patterns and round patterns aredesigned for switchboard work. The alternating-cur-rent type contains a dynamometer movement made upof a fixed field coil and a moving coil as the illustration on this page shows. The direct-current type, which isshown in another illustration, operates upon thedArsonval principle, and has a small, light and strongmoving coil. A dead beat quality in all these modelsis secured by the use of a light aluminum vane. Safety First in SwitchboardConstruction Manufacturers of electrical apparatus have beenamong the foremost in propagating and practicing thesafety-first idea. The General Electric switchboardshown in the illustration on this page is a product madewith this idea in mind. All live parts except meterreceptacles are inaccessible from
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Keywords: ., bookcentury1900, bookdecade1900, bookpublishernewyorkmcgrawhillp
