Allen, Charles Ricketson, 1862- [from old catalog] · New York, H. Holt and company · leaf 53
The instrument commonly used inmeasuring resistance is called a resistance-box or rheostat.It is an arrangement by which different coils of wire ofknown resistance may be placed in the circuit. A com-mon form, together with a sign for a diagram, is shown 40 CURRENT ELECTRICITY. in Fig. 27. It… … in the circuit when the end of the switch rests on thathead. One switch (the one at the right in Fig. 27) placesfrom 0 to 1 ohm in the circuit, the second from 1 to 10ohms, and the third from 10 to 100 ohms. By using allthree switches, any resistance from 0 to 111 ohms maybe placed in the circuit.…
Physics
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