68

Frill-Range Series Resistance Box.

Same construction as the above.

Sui-divided Megohm.

Ten equal resistances connected to 11 pillar terminals and coils wound for use on high voltage circuits

Metre Bridge.

With key sliding along brass bar with terminal at end, and so constructed as not to dent the slide wire.

Savages’ Special Caile Testing Key. (Fig. 11.)

Designed for use with a concentric or guarded conductor [see Ayrton and Mather, Physical Society of London, January 26, 1900). It combines a battery reversing key, charge and discharge key, and short circuiting key, all on the same base. An extra lever, to which the outer conductor of the cable is connected, is linked to the discharge key.

Fig. 11.

The distance between the contacts is so proportioned that the outer conductor is charged or discharged immediately

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