National Telegraphic Union · New York : N.T.U. · leaf 64
Vol. IV-No. 7. New-York, Saturday, October 12, 1867. Whole No. 65. W. G. BROWNSONS PATENT TELEGRAPH SWITCH-BOARD. … One of the most important points in the arrangementof a telegraph office, is to have the switches so arrangedthat any desired change may be made in the connectionsof the different wires, instruments and batteries, withoutthe annoyance of unscrewing and changing the positionof the wires. The annexed…
Telegraph
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