The Type 1611-B Capacitance Test Bridge (Figure 1) is a direct-reading capacitance bridge designed for wide-range capacitance and dissipation-factor measurements at 60 and 120 cps. (At 120 cps, an external generator is required; the Type 1214-D is recommended.) Measurements can be made at other audio frequencies up to about 1000 cps with reduced sensitivity. For such measurements an external generator and filter are required. The bridge is suitable for laboratory and shop testing of paper, mica, and electrolytic capacitors. It also meets the needs of the electric-power industry for shop testing of insulators, particularly for dissipation- factor measurement of bushings, insulators, transformer insulation, rotating machinery, and cables. For the wire and cable manufacturer, the bridge offers a convenient and rapid means of locating breaks in cable and of performing laboratory and production tests of dissipation factor and capacitance on all kinds of cable. The bridge’s many applications in the communications industry include checking capacitance to ground of transformer windings, shields, and circuit elements, as well as routine capacitance and dissipation-factor tests on electrolytic capacitors and other components.