American telegraphy and encyclopedia of the telegraph; systems, apparatus, operation (1909)
Maver, William, jr. [from old catalog] · New York, Maver publishing company · leaf 160
gram of the Wheatstone bridge, we havep, a battery exerting a pressure at a of, say, 80 volts. R u are known resistances,consisting of coils of wire, each havijag a resistance of 800 ohms, b, is a resistancebox, or rheostat, having adjustable coils, jc is a length of wire the resistance of whichit… … It has been stated that as long as there is unequal pressure at the terminals of aconductor, current will flow in its coils from the point of higher to the point oflower potential, but that, when the pressure is equal, and opposite in direction, atthose terminals, current will not flow. The…
Telegraph
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