Principles and practice of electrical engineering (1914)
Gray, Alexander, 1882-1921 · New York [etc.] McGraw-Hill Book Company, inc. · leaf 52
strip metal wound on a frame consistingof an iron plate A insulated at the edges with porcelain sup-porting pieces B. These units may be mounted on iron rodswhich pass through the holes C. 34. Heater Units.—Fig. 30 shows the external appearanceof a type of resistor which is largely used for… … Fig. 32.—Resistance unit. proof cement to insulate adjacent turns from one another, andthe open end of the tube is closed with a cement plug throughwhich the leading in wires are brought. Another type of heater unit is shown in Fig. 31 and consistsof a length of resistance wire wound into a helix…
Electrical engineering
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