American telegraphy and encyclopedia of the telegraph; systems, apparatus, operation (1909)
Maver, William, jr. [from old catalog] · New York, Maver publishing company · leaf 92
AY. The Box Relay.—This is an ordinary Morse relay, the coils of which are cov-ered by a square, or oblong, wooden box, as seen in Fig. 48. Holes are cut in the leftend of the box opposite the front contact point of the amature lever, and opposite theends of the cores of the relays, and at the… … BOX RELAY. This form of relay is mostly used by linemen, or others, in testing, or for temporaryoffices when a local battery is not to be had, or may not be desirable. The box overthe coils acts as a sounding board, and increases the sound of the signals to such an ex-tent as to make them clearly…
Telegraph
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