. The railroad and engineering journal . Fig- 4. force of about no volts at terminals of machine ; they areto be aulomatically regulated, so that three-fourths of thelamps may be extinguished with safety without materialchange of speed. They must not spark, and must not re-quire the brushes to be shifted to accommodate change ofload. Their commercial efficiency must be at least 80 per. Fig. 6. cent. An Evans friction cone of the proper size to trans-mit the full power of the engine is to be furnished witheach dynamo. The engines and dynamos are to be so located that,with the Evans friction con
. The railroad and engineering journal . Fig- 4. force of about no volts at terminals of machine ; they areto be aulomatically regulated, so that three-fourths of thelamps may be extinguished with safety without materialchange of speed. They must not spark, and must not re-quire the brushes to be shifted to accommodate change ofload. Their commercial efficiency must be at least 80 per. Fig. 6. cent. An Evans friction cone of the proper size to trans-mit the full power of the engine is to be furnished witheach dynamo. The engines and dynamos are to be so located that,with the Evans friction cones, either engine can run eitheror both dynamos. The dynamos will therefore be fur-nished with sliding bed-plates, so that they can quickly bethrown in or out of action. The actual floor space occupied by the dynamos andengines must not exceed SJ x u ft. Attached to the engines or dynamos must be a devicefor alternately opening and closing, at regular intervals,the circuits to the lights at the mastheads ; this device Fig. S- Twenty 16 candle - power lamps, with key sockets,brackets, shades, and shade-holders, safety strips, are tobe furnished and placed in position in the light-vesselwhere it may be directed. All lamps must last at least600 lamp hours, must be interchangeable in their sockets,and each lamp must be marked with its candle-power andresistance when cold, and must
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectrailroa, bookyear1887
