亨利示意他的助手将线圈断开连接，此时，电流计上又一次指示出一个电压，但这次的电压是反向的。
Henry signalled his assistant to disconnect the coil. The galvanometer showed that once again a voltage had been produced, although this time in the opposite direction.
电流计：根据可动线圈的偏转量来测量微弱电流或电流函数的仪器。
Galvanometer: Instrument for measuring small electric currents by deflection of a moving coil.
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