To obtain bigger scintilla, 1856, in tile of British electrician technician (C.F.Varley, 1828 ～ 1883) also was made to Ka Lan transformer improve (graph 9, graph 10) , he uses a double knife double cast switch changes voltaic way back and forth, the electric current that makes coil A medium is alternant haul, thereby the induction in coil B gives to hand in change electric current, because this can say, the induction coil in tile is the first ancestor that communicates transformer.
1862, morris (Morris) , Wei Er (Weave) and Mengkedu (the patent that Moncktom) obtains to use induction coil at alternating current.
1868, luo Fu of British physicist case (W.R.Grove, 1811 ～ 1896) uses the plant that the graph shows 9 times to be linked together V of alternating current source and coil A, the alternating current with a different voltage gets in coil B. Because induction coil of this case Luo Fu is transformer of the first communication actually.
After afterwards case Luo Fu, a lot of people undertook study to induction coil, put forward a few improve a proposal. For example, american is rich strap (J.B.Fuller) is in 19 centuries had academic research to induction coil at the beginning of 70 time, put forward induction coil to should be used close core, former edge coil uses parallel connection and not be at that time the series that place of most induction coil introduces. But his idea has talked to his boss only before one's death, after dying till him before long, people discovers his manuscript. Feburary 1879, people makes his manuscript tonsorial list, his tentative idea about induction coil just be able to fair all at the world.
1876, husband of strange division of the name of a river in Shaanxi and Henan provinces of Russian physicist elegant suddenly (Л . Н . в of о of к of ч of о of Я ъ л , 1847 ～ 1894) invents ” of “ report candle, use an induction coil of two winding, former edge and alternating current source are linked together, for high-pressured side, the alternating current of side of deputy margin low pressure illuminates to “ report ” power supply. This induction coil is one does not close actually the single-phase transformer of magnetism core.
1882, russian engineer И . Ф . The high pressure that Wu Sajin exhibited to have induction coil of step up, step-down first in Moscow changes electric unit.
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