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voltage coil be used, the voltage for the condenser circuit may be transformed up by using the line wire coils to supply it.

For example — Capacity, mfds. Volts, for 10 mm.

Volts on C - Condenser on AB - 5 0’005

C - C - 2’5 0’031

AB - AB - 1 0’22

AB - C - 0’1 31

The sensitivity may be increased by connecting the magnet coils to a separate source of supply at 100 or 200 volts. By this means less than one micro-volt may be detected.

The application of the instrument to the measurement of large and small capacities down to 0’00005 mfd. will be understood from the above. It may be used for such purposes as determining the effective resistance of a conductor placed in series with a similar resistance of known properties.

By means of series quadrature transformers it may be used as a wattmeter,, and it will measure very small powers when used in this manner.

Cohens Interrupter. (Fig. 29.)

(“ Phil. Mag,” Sept. 1908.)

Fig. 29.

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