American telegraphy and encyclopedia of the telegraph; systems, apparatus, operation (1909)
Maver, William, jr. [from old catalog] · New York, Maver publishing company · leaf 161
X 640000 o As stated in the case of examples already given, it is not necessary that the re-sistances of the arms k k, Fig. 104, should always be equal—indeed, if that were thecase the usefulness of the Wheatstone bridge would be much diminished—for byvarying the resistances in e and e it is… … For example. It is desired to measure the resistance of a wire, or any othersubstance, which we find to be greater than the total resistance of the rheostat. If,in Fig. 106, we place in e a resistance of 10 ohms, and in e iooo ohms and find itnecessary, in order to get a balance, to insert 10,000…
Telegraph
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