A text-book of physics : with sections on the application of physics to physiology and medicine (1902)
Lehfeldt, Robert Alfred, 1868-1927 · London : E. Arnold · leaf 256
ng a watertap, when the energy of the current of water spends itself ingiving a violent jar to the pipe. When it is desired that the break shock should be of aboutthe same intensity as the make, a modified arrangement due toHelmholtz may be adopted : this is to short-circuit the primarycoil instead… … Fig. 88. when the key is closed, it acts as a short circuit, and divertspractically all the current from the coil; thus the magneticinduction produced by thecoil is destroyed, but as -Li- the circuit is not broken,the current can die awaygradually just as it risesgradually, and the abruptchange…
Physics
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