. Electric railway journal . d 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
. Electric railway journal . d 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 the front of the most important development is the mounting of thefield switches on the back of the board. The switch isoperated by a handle in front of the board and theoperat6r is protected from injury by the arc or by com-. SWITCHBOARD SHOWING PROTECTED FIELD SWITCHES ANDOTHER SAFETY FEATURES ing into contact with live parts. For testing instru-ments the board is provided with calibrating receptaclesinto which may be inserted plugs connected to the stand-ard instruments. Removable screw plug fuses providefor the replacement of secondary potential transformerfuses from the front of the board. Grillwork screens with locked doors afford protectionagainst accidental contact with live parts in the switches are used between all oil circuitbreakers and busbars and provide convenient and rapidmeans for isolating the breakers when inspecting, chang-ing oil or repairing. The police authorities of Louisville, Ky., have beenasked by the Louisville Railway and the school officialsto undertake to control rowdyism on the part of schoolboys on their way to and from school. One of the fa-vorite pastimes of the boys, especially where they rideon the trailers, is to rock the
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