. Electric railway journal . n which tends to stretch the surface of thecasting and to make it bow up, convex laterally, awayfrom the spelter. The key fastening counteracts thistendency and holds the center rigid. In Berlin, Germany, mirrors have been attached to thesides of cars at the height of a passengers head whenstanding on the lower step. It is hoped by this means toreduce run-down accidents. 1220 ELECTRIC RAILWAY JOURNAL [Vol. XLIII, No. 22. WATT-HOUR DEMAND METER A demand meter, known as Type RO, has been re-cently placed on the market by the Westinghouse Elec-tric & Manufacturing Com
. Electric railway journal . n which tends to stretch the surface of thecasting and to make it bow up, convex laterally, awayfrom the spelter. The key fastening counteracts thistendency and holds the center rigid. In Berlin, Germany, mirrors have been attached to thesides of cars at the height of a passengers head whenstanding on the lower step. It is hoped by this means toreduce run-down accidents. 1220 ELECTRIC RAILWAY JOURNAL [Vol. XLIII, No. 22. WATT-HOUR DEMAND METER A demand meter, known as Type RO, has been re-cently placed on the market by the Westinghouse Elec-tric & Manufacturing Company, and is shown in theaccompanying illustration. This is a single meter thatrecords without the use of a clock mechanism both thekw-hr consumed and the maximum kilowatt demand,thus providing the readings needed on systems thatbase their charges on maximum demand and powerdelivered. Both readings can be taken monthly. Themeter records the maximum demand of the connectedload but not the time at which the maximum Watt-Hour Demand Meter The maximum demand is indicated by a pointer sweep-ing over a 4-in. dial, and the watt-hour load is recordedon a four-dial counter. The instrument has no clock, contacts or other deli-cate parts. It is a combination of an induction watt-hour meter, an induction wattmeter and an escapementform of time element. In addition to the usual watt-hour meter movement, including electromagnet, per-manent magnet, and aluminum disk, the instrumentcontains an auxiliary disk sector supported on a jewel-and-ball bearing so that it can move in the air gap ofthe electromagnet in such a way that it does not inter-fere with the accuracy of the main disk, which alwaysrotates at a speed proportional to the load. The rota-tion of the auxiliary disk is restrained by a spiralspring, making its final deflection proportional to thewatt load. The auxiliary disk with its spring andpointer constitute an indicating wattmeter. The shaft of the auxiliary disk is geared
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