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.
按照图101设置测试装置，使油液反向流入保险并断开回油管。
Setup Schematic, Figure 101, with fluid flow directed into the fuse in reverse direction, and return line connected.
施加反向电压以增大穿隧间隙，提高电阻，可以重新将开关断开。
Applying the opposite voltage bias to widen the tunneling gap and raise the electrical resistance would reopen the switch.
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