The practical telephone handbook and guide to the telephonic exchange (1906)
Poole, Joseph · New York, Macmillan Co. · leaf 255
entanglement. Another method of providing for a long cord is to build theswitch-board on a false floor, raised about 1 foot or more abovethe ordinary floor, an opening being left for the pulley weightsto pass through. This construction adds 2 feet, or doublethe height of the false floor, to the… … *• ••••••♦•♦«#♦•• ,»••,»» feSs^asaSa^ COMMON BATTERY MULTIPLE SWITCH-BOARDS 229 caps of the supervisory lamps are also protected from damageby perforated metal caps. Operators Jacks.—On the under side of the key-board twoinstrument jacks are fitted to each operators position—one toconnect her own…
Telephone
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