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 186
scale, it is possible todetect a very slight motion of the magnet, and thus an exceed-ingly minute current even down to one fifty-billionth part ofan ampere (2 x 10~n) can be observed. But the Thomson galvanometer cannot be made to returnquickly to its zero position, nor can it be made deadbeat.In… … Fig. 96. — Thom-son astatic gal-vanometer. 158 ELECTRICITY AND MAGNETISM magnet; such an instrument is called the dArsonval type.This contains the essential principles of most of our moderncommercial ammeters and voltmeters and is constructedon just the reverse principle of the Thomson type. The…
Electricity · Magnetism
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