Elementary treatise on physics experimental and applied for the use of colleges and schools (1890)
Ganot, A. (Adolphe), 1804-1887, Atkinson, E. (Edmund) · New York : W. Wood · leaf 993
-954] Resistance Coils. 967 usually employed in what are called resistance boxes (fig. 950). Fig. 951represents the way in which resistance coils are affixed inside the box. Onthe top of the box, which is of slate or ebonite, are a number of solid pris-matic pieces of brass fixed a littledistance…
Physics
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