Lynde, Carleton John, b. 1872 · New York : Macmillan · leaf 229
the coU turns, it twists the finecopper ribbon, and the elastic force tend-ing to untwist the ribbon acts against themagnetic force turning the coil. Themirror attached to the coil is used tomeasure the current, as follows. A scaleand telescope are so placed that an image of a small part of the… … Fig. 152. — The voltmeter. scale is brought into view. The difference between the twoscale readings serves as a measure of the current. Commercial measuring instruments. — The voltmeter, Fig.152, is used to measure the e. m. f. of a current in volts. Theammeter, Fig. 153, is used to measurethe…
Physics · Home Economics
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