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 217
Fig. 120. — Box of known resistances. in weighing. Such boxes contain spools of silk-covered wire,each of known resistance, which may be needed in electricalmeasurements. Manganin or some similar alloy, havinga comparatively low conductivity and a small temperature … Fig. 121. — Spools of wire fastened to under side of cover of resistance box. coefficient, is generally used in making fhe spools or coils forndistance boxes. In making the coils the proper lengthof wire for each is taken and doubled at the middle, and itis then wound double upon a spool. The…
Electricity · Magnetism
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