American telegraphy and encyclopedia of the telegraph; systems, apparatus, operation (1909)
Maver, William, jr. [from old catalog] · New York, Maver publishing company · leaf 588
that time; but immediately onthe commencement of the upwardsweep the extra opening is closed.Means are also provided whereby,when the crank lever has beenpulled, the pointer p is locked untilthe box number has been trans-mitted. These devices have beenomitted in the figure for the sake of… … FIG. 354.
Telegraph
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