Modern Practice of the Electric Telegraph a Handbook for Electricians And Opera

Cover Modern Practice of the Electric Telegraph a Handbook for Electricians And Opera
Modern Practice of the Electric Telegraph a Handbook for Electricians And Opera
Frank L Franklin Leonard Pope
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(170. ) The second method is very convenient and is much used, although not equal in strict accuracy to the third method. The galvanometer coils are wound with two wires of the same length and resistance, insulated from each other with the utmost care. The needle is there- fore surrounded by an equal number of convolutions of each wire, which are also equidistant from it. One end of each wire is connected to the battery, but in such a manner that the current flows in opposite direc- tions throu...gh the two wires. When, therefore, the two currents are of equal strength, one tends to deflect the needle to the right and the other to the left with equal power, and the needle remains at rest. If we insert an unknown resistance into the circuit of one of these wires the current is weakened, as is also its effect on the needle, which no longer remains balanced and at rest, but is deflected to one side. If we now insert a series of known resistances into the circuit of the other wire, until the needle is again brought into equilibrium, we are certain that the unknown resistance in one cir- cuit is exactly equal to the known resistance in the other.

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