Electrical installations of electric light, power, traction and industrial electrical machinery (1902)
Kennedy, Rankin, d. 1917 · Edinburgh T.C. & E.C. Jack · leaf 76
Fig. 54-—Ayrton andPerrys Spring Spring Control … when once magnetised by the coil does not lose its magnetisminstantly when the current is cut off, neither does its magneticstrength fall in proportion to the fall in current strength in thecoil; it keeps a small proportion of magnetism. This may be better understood by an example. Suppose weare…
Electrical engineering · Electric power
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