An elementary book on electricity and magnetism and their applications (1919)
Jackson, Dugald C. (Dugald Caleb), 1865-1951, Jackson, John Price, b. 1868, Black, Newton Henry, b. 1874 · New York, The Macmillian Co · leaf 201
are of the current flow-ing in the coils, since the magnetism set up by each coil is proportionalt<> the current, and they act on each other mutually. So the angle ofdeflection is proportional to the current squared. The pointer N indi-cates whether the movable coil is at its zero position.… … Fig. 107. Siemens electrodyna-mometer. ELECTRICAL MEASURING INSTRUMENTS 173 efl are correct for alternating currents. It can be made verysensitive and accurate, but it does require considerable skillto manipulate it and so its use is largely confined to testinglaboratories. If the coils are made of…
Electricity · Magnetism
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