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 196
at is shown in figure 102 has three bindingposts. The instrument is connected to a circuit by binding ELECTRICAL MEASURING INSTRUMENTS 167 posts A A for ordinary use. Then, when the key K is closed,current flows through the high-resistance coil E and the mov-able coil C, and the pointer is… … Fig. 102. — Plan of Weston voltmeter. thence through the movable coil C. The coil e is adjusted sothat the resistance between binding posts Aa is just onetwentieth of the resistance between binding posts A A, and theinstrument is therefore twenty times more sensitive when thebinding posts Aa are…
Electricity · Magnetism
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