Dodge, Mary Mapes, 1830-1905 · New York : Scribner · leaf 568
ole made at the forward end willadmit a brass screw, that in turn will hold aspool-end to act as a finger-piece. The screwcan be cut off and riveted at the under side. Ashort, strong spring is to be attached to the backof the base-block and to the end of the key-barby means of a hook, which is made… … FIG. 29. TELEGRAPH-KEYWITH SWITCH. FIG. 30. DETAILS OF TELE-GRAPH SOUNDER ANDLINE INSULATOR. plate and the connector-posts at the oppositeside of the key base so that if necessary the cir-cuit may be closed, or an arm may be caughtunder the screw at the L plate and brought for- 1120 THE PRACTICAL…
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