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 215
other I2through AD. A sensi-tive galvanometer isconnected between Cand D. Then the resistances R, m, and n are so adjustedthat no current flows through the galvanometer, which meansthat all of 7i has to go on through CB and all of I2 through DB,and also that C and D are equipotential points.… … Fig. 119. — Wheatstone bridge to balance re-sistances. Slide-wire form. ELECTRIC MEASUREMENTS 187 For similar reasons hX=Ln. (2) Dividing equation (1) by equation (2), we have R = m X~~ n From this fundamental equation of the Wheatstone bridge,if we know R, m, and n, we can compute X. In one form…
Electricity · Magnetism
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