171

A damping resistance, R,, adjustable from 10 to 500 ohms.

Inductive shunt for current waves, three ranges, 2 to

25 amperes. (Fig. 34. S. R. P.)

5

DTE SR

B 2

Instantaneous camera with eight plate carriers and trigger arrangement, for projecting the plate at a suitable velocity at right angles to the direction of motion of the spot of light.

Campbell Variable Mutual Induction Standard. (Fig. 35.)

(" Phil. Mag.," Jan. 1908 ; also “ Electrician,” Feb. 1908.)

This instrument provides direct reading inductances from 0'0002 up to 11 millihenries.

The handle and pointer read from -- 2 up to 102 microhenries, and there are 10 additional coils of 100 microhenries.

By a further multiplying arrangement these values are increased 10 times. The scale is most open at the lower values, thus diminishing the percentage error. Mutual inductances are preferable to self-inductances for small measurements, as their value is more easily calculated, and they can be reduced to zero and made negative.

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