. The Street railway journal . y alternating current isavailable. This rectifier set is designed for operation ona 220-volt, a. c. circuit, and has a continuous capacity of30 amp d. c. and a capacity of 40 amp or slightly more dur-ing the starting of the arc. The rectifier is designed to de-liver a d. c. voltage equal to that required across the arc,or from 45 to 50 volts. A reactance in series with the a. serves to steady and regulate the current taken bythe arc lamp. This eliminates the necessity of having aresistance in the arc circuit. The rectifier set is similar in some particul
. The Street railway journal . y alternating current isavailable. This rectifier set is designed for operation ona 220-volt, a. c. circuit, and has a continuous capacity of30 amp d. c. and a capacity of 40 amp or slightly more dur-ing the starting of the arc. The rectifier is designed to de-liver a d. c. voltage equal to that required across the arc,or from 45 to 50 volts. A reactance in series with the a. serves to steady and regulate the current taken bythe arc lamp. This eliminates the necessity of having aresistance in the arc circuit. The rectifier set is similar in some particulars to thebattery charging rectifier now in common use. The regu-lating features and other parts necessary for battery charg-ing, but not required for this service, are omitted, and therectifier equipment reduced to its simplest form. The rec-tifier may be installed at a distance from the picture-machine operator and started by the operator without leav-ing his booth. To start the rectifier the supply switch is closed and tlic. MERCURY ARC RFXTIFIER carbons of the lamp held together for a second or separating the carbons a direct-current arc is closing of the carbons allows the current to flowthrough the shaking coil on the panel which tilts the tubeonce or twice and causes it to start. The rectifier not onlyfurnishes direct current for the arc lamp so that far betterlight can be obtained from an alternating-current circuit,but the cost of the operation will be found very much lessthan with either a. c. or d. c, with a resistance in serieswith the arc. BALL-BEARING EXHAUSTERS The Massachusetts ball-bearing exhauster, made by theMassachusetts Fan Company, of Watertown, Mass., is adeparture in fan design. The bearings are of the Chapmandouble-ball type, and are said to possess the following im-portant advantages over the plain journal—absolute align-
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
