Telegraph engineering : a manual for practicing telegraph engineers and engineering students (1922)
Hausmann, Erich, 1886- · New York : D. Van Nostrand Company · leaf 131
sk C,The escapement is controlled by an electromagnet mthrough the keyboard K. Upon the depression of anykey no current from the battery B will flow through theelectromagnet .until the contact arm a reaches the contactstud corresponding to the key depressed. At that instantthe armature of magnet m… … Fig. 6. work through the gear-wheel g, but this rotation is con-strained by means of the escapement wheel w. The arma-ture of polarized relay P controls this escapement wheel.The rear end of the armature of printing relay R, whenthis instrument is operated, presses the tape, which movesover the…
Telegraph
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