Principles and practice of electrical engineering (1914)
Gray, Alexander, 1882-1921 · New York [etc.] McGraw-Hill Book Company, inc. · leaf 54
tion such as asbestos. The resistance of such a pile decreases asthe mechanical pressure between the ends increases, because thecontact between adjacent discs improves. In the type of rheo-stat shown in Fig. 36 the pressure is applied by turning the hand-wheel D and is communicated to the carbon… … Fig. 37.—Liquid rheostat. 37. Liquid Rheostats.—Such a rheostat is shown in Fig. 37and consists of a cast-iron trough A which contains a solution ofcaustic soda or some similar material which does not attack iron,and an iron plate B which is insulated from the tank as shown at Eand which dips into…
Electrical engineering
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
![An illustration from [Graphophone patents] (1878)](https://img.insideoutlibrary.com/img/200/ia-graphophonepaten07unit-365-245.webp)
