American telegraphy and encyclopedia of the telegraph; systems, apparatus, operation (1909)
Maver, William, jr. [from old catalog] · New York, Maver publishing company · leaf 91
ockets, or spectacles into which the coils of the relay fit, as shown. Pocket Relay—^This relay is designed for use in line testing, as, for instance,when a break may huve occurred on several wires, and the foreman is taking orders orgiving them, etc. It is placed directly in the main line. The… … POCKET RELAY. ?!B^ lever of this instrument is such as to 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…
Telegraph
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