. American engineer and railroad journal . s suchthat each engine can run either generator or both if de-sired, the change being made very rapidly by means ofdouble-acting ratchets and sliding bed-plates. The actualfloor-space occupied by the dynamos and engines does notexceed g X 8 ft. Each dynamo is amply capable of light-ing the entire vessel by itself, but two are used for thesake of safety. If desired, either generator can lurnishcurrent to the masthead lights and the other one to thelamps below decks, and, in fact, the whole system is en-tirely interchangeable. Duplicate armatures and rh
. American engineer and railroad journal . s suchthat each engine can run either generator or both if de-sired, the change being made very rapidly by means ofdouble-acting ratchets and sliding bed-plates. The actualfloor-space occupied by the dynamos and engines does notexceed g X 8 ft. Each dynamo is amply capable of light-ing the entire vessel by itself, but two are used for thesake of safety. If desired, either generator can lurnishcurrent to the masthead lights and the other one to thelamps below decks, and, in fact, the whole system is en-tirely interchangeable. Duplicate armatures and rheostatsare kept ready tor emergencies in addition to such acces-sories as brushes, switches, fuse blocks, etc. The mast-head lights consist of eight loo-candle-powerlamps, four on each mast in multiple. Each lamp isplaced in a separate lantern with the triple loop of its fila-ment in the focus of the lens, and the four lanterns aresymmetrically placed about the mast-head. Lead-coveredHabirshaw cables of seven strands imbedded in the masts. ■ DYNAMO PLANT OF LIGHTSHIP NO. 51. carry the current to these lights. If, in spite of all theprecautions that have been taken, the electric plant, or apart of it, should become disabled, the lamps may bequickly removed from the lanterns, the sockets instantlymoved out of the way, and oil lamps substituted while re-pairs are being made. The lanterns, it should be added,are swung on trunnions to keep the beam ot light hori-zontal. In order to distinguish one from another, lightvessels, as well as lighthouses, are provided with revolvinglenses, making flashes of a certain duration ; thus a ten-second flash with a five-second interval may show thepilot who has lost his bearings that he is not far from ttieright course, while a 20-second flash and a is-secOnd in-terval show him that he is near a dangerous reef. Thecombinations are infinite in number, and each has itsespecial significance. In this instance, however, insteadof the heavy revolving
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectrailroadengineering
