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 205
mometer. If the speed of such an armature is made to be proportionalto the magnetic pull, every revolution of the armature meansa certain number of watts used for a fixed length of time. Suchinstruments usually have a set of dials attached to the spindleof the armature (Fig. 112) like those of a… … Fig. 111.— Interior of Thomsonwatt-hour meter. ELECTRICAL MEASURING INSTRUMENTS 177
Electricity · Magnetism
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