American telegraphy and encyclopedia of the telegraph; systems, apparatus, operation (1909)
Maver, William, jr. [from old catalog] · New York, Maver publishing company · leaf 92
produce a very fair sound. Poxy Relays.—This is a name given to a relay which differs from the main linerelay only in minor details of construction, and in the resistance, or winding of its coils. THE BOX RELAY. 65 which varies from about 20 to 100 ohms. It is mostly used on private lines. Forlines… … PONY RELAY. 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…
Telegraph
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