Electrical installations of electric light, power, traction and industrial electrical machinery (1902)
Kennedy, Rankin, d. 1917 · Edinburgh T.C. & E.C. Jack · leaf 75
thecoil with a force in some proportion to thecurrent, and against the force of the spring.By this action the travel of the pointer indi-cates the current. On this principle manymanufacturers make instruments ; in fact, it isthe favourite type for cheap indicators sonumerously required in practice.… … Fig. 54-—Ayrton andPerrys Spring Spring Control
Electrical engineering · Electric power
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