I.C.S. reference library : a series of textbooks prepared for the students of the International Correspondence Schools and containing in permanent form the instruction papers examination questions, and keys used in their various courses (1904)
International Correspondence Schools · Scranton : International Textbook Co. · leaf 418
§s ELECTRICITY AND MAGNETISM. 39 ohm coils. The commercial form of standard ohm coils isshown in Fig. 3(j. … 51, A device called a resistance box or rheostat is largely used for reducing or controlling the strength ofcurrents in various circuits. Suchrheostats are connected directlyin series or shunt with the cir-cuit, and are termed dead resisf-ances. The resistance in theserheostats is usually made…
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