Incandescent electric lights . 90 with greater average economy of power,that it will be less liable to derangement,and may be driven without variation ofspeed by a smaller engine; also that thenew machine is free from the objection ofhaving its currents reversed when usedfor the purpose of electro deposition. The same peculiarity also enables meto effect an important simplification of to work electric lamps, to dis-; pense with all wheel and clock-work inthe arrangement, as shown in Fig. 1. Thetwo carbons, being pushed onward bygravity or spring power, are checkedlaterally by a p
Incandescent electric lights . 90 with greater average economy of power,that it will be less liable to derangement,and may be driven without variation ofspeed by a smaller engine; also that thenew machine is free from the objection ofhaving its currents reversed when usedfor the purpose of electro deposition. The same peculiarity also enables meto effect an important simplification of to work electric lamps, to dis-; pense with all wheel and clock-work inthe arrangement, as shown in Fig. 1. Thetwo carbons, being pushed onward bygravity or spring power, are checkedlaterally by a pointed metallic abutment,situated at such a distance from the arcitself that the heat is only just sufficientto cause the gradual wasting away of thecarbon in contact with atmospheric carbon holders are connected withthe iron core of a solenoid coil, of a re-sistance equal to about fifty times that ofthe arc, the ends of which coil are con-nected with the two electrodes respect-ively. The weight of the core, which has. 91 to be maintained in suspension by theattractive force produced by the current,determines the distance between theelectrodes, and hence the electric resist-ance of the arc. The result is that thelength of the arc is regulated automati-cally so as to maintain a uniform resist-ance, signifying a uniform development oflight. APPENDIX. The measurements of the electric cur-rents were made with an electro dyna-mometer, the movable part of which con-sisted of a single turn of 4 wire, andthe stationary coil of nine turns of thesame. To be able to reduce the electricalmeasurements into absolute power devel-oped, it was in the first place necessary todetermine the constant of the instrumentin use. This was done in the followingmanner: Five copper plates of about11 X 8 were connected as shown hi thesketch. 92 These were carefully weighed and im-mersed i in a solution of sulphate of cop-per. The machine was previously started,the time of immersion carefully no
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Keywords: ., bookcentury1800, bookdecade1880, bookidincandescent, bookyear1882
