Jersey City has recently combined a very compact and effective instrument. using a quantity of these coils or spools of wire. needle a little produce deflections which are propor tional to their force ; a current twice as strong pro ducing twice the deflection. This law holds good only for small angles of deflection. As the angles increase it requires a greater addition to the current to add an 1866 SCIENTIFIC AMERICAN INC., 1866-06-02
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