The Type 625-A Bridge consists of a skeleton bridge circuit with provision for plugging in standard and unknown units to obtain'a variety of circuits. The main feature of the -bridge is a large dial which is used for balance and which forms one of the ratio arms. The bridge contains both a d-c and a 1000- cycle a-c source of voltage. Provision is made for operation from an external source. When combined with suitable standard arms, the bridge can be used for the measurement of resistance, inductance, or capacitance. Direct current or alternating current for frequencies up to 5000 cycles may be used as a bridge source. The accuracy which will be obtained depends, of course, upon the type of standards used. With the equipment recommended in this instruction book the accuracy should be 2% for measurements of rer- sistance, Inductance, and capacitance, provided instructions are followed. The accuracy of the portions of the circuit contained within the Type 625-A Bridge Is 1%.