. Electrical instruments and telephones of the Signal corps . I^IG. 2tj broken lines. The resistance of the relay coils is now almost uni-versally 150 ohms, although on some short lines a •pony relay ofJO ohms is Fig. 27. The box relay with the key on the base is shown in figure JJ. Thisrelay has a heavier lever for giving a louder sound than that of theordinary relay, the resonance of the box assisting. As it may be used

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