Cyclopedia of applied electricity : a general reference work on direct-current generators and motors, storage batteries, electrochemistry, welding, electric wiring, meters, electric lighting, electric railways, power stations, switchboards, power transmission, alternating-current machinery, telegraphy, etc. (1916)
American Technical Society · Chicago : American Technical Society · leaf 345
ul control magnetnear by (above, below, or behind)so as almost entirely to counteractthe influence of the magnetic field,due to the earth, on the magnet atthe center of the coil. An extremely sensitive galvanometer may be made by combin-ing the control magnet with the astatic system of magnets.… … Fig. 13. Tangent Galvanometer
Electrical engineering
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