Channing, William F.(William Francis),1820-1901 · Boston : Thomas Hall · leaf 213
he office table by means of wires. 324. In order to bring the constant batterywithin the grasp of the operator with as muchfacility as the electro-magnetic apparatus, I havehad a switch- and key-board constructed by Mr.Hall for the office table, which gives entire controlover any number of cups of… … pairs are connected by wires with the screw cups atA, and thence under the board with the correspond-ing divisions of the switch-board B. The terminalcups of each group of ten are connected with thescrew cups at C, and thence under the board withthe corresponding divisions of the switch-board D.By…
Electrotherapy · Medicine, Physical · Electricity
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