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64

Designed in conjunction with Mr. B. Davies of “ Electra House,” and now largely in use on the different telegraph stations throughout the world, for which purpose it was more particularly designed. The movement is damped to work at a speed of two seconds, but for “ speaking,” an adjustment is provided for reducing the working length of the suspension. High surface insulation is provided for use in bad climates, and all working parts are easily accessible for examination or repair.

With a coil of 750 ohms the approximate-sensitivity at a metre scale distance, and at a speed of two secs, is 80 mm. per micro-ampere.

" Fool-proof ” Galvanometer. (Fig. 3.)

Can be handled by a man of no experience without fear of injury. This instrument is of the iron core moving coil type, with magnet shaped to give proportional scale readings, with either the pointer or mirror, and is macle in two patterns.

(a) With pointer and mirror for use with lamp and scale ; or

(b) With pointer only.

Approximate sensitivity. Coil resistance 100 ohms. Deflection of one degree is obtained with the pointer, with 1:4 volts through one megohm, or 30 mm. under the same conditions with the lamp and scale.

CO

6

Wall Galvanometer. (Figs. 4 and 5.)

Latest pattern iron-core moving coil type, with magnet shaped to give proportional scale readings, either with pointer or with lamp and scale. This galvanometer is supplied with

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