American telegraphy and encyclopedia of the telegraph; systems, apparatus, operation (1909)
Maver, William, jr. [from old catalog] · New York, Maver publishing company · leaf 174
the bridge wire, and b, beyond x, is balanced by the adjustable resistance k. Since the wire a is in the bridge wire on one side of the cross andopen on the other side of the cross it is easily understood that itsresistance may be neglected, and since wire b is not tested through the crossthe… … For example. Let us call the portion of the wire b, between c and .r, f, andthat portion between ^and the earth at z, r. When a balance is secured in theWheatstone bridge it is known that ris to r -fR,as f is to f -|- f. Assume that theresistance of r is 20 ohms, and that it is necessary to insert…
Telegraph
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