Telegraph engineering : a manual for practicing telegraph engineers and engineering students (1922)
Hausmann, Erich, 1886- · New York : D. Van Nostrand Company · leaf 124
les, or guide holes, are o.i inch apart when the perforator o 00 o 00 o o 00 00 00oooooooooooooooooooooooooooo \ o 00 000000 o 00 06 Fig. I. is properly adjusted. A dot appears as three holes in avertical line, a space appears as one guide hole, and a dashappears as four holes: two guide holes and… … Fig. 2. and removable punch-ends is shown in Fig. 2. The de-pression of the left plunger punches a dot, the center plungerpunches a space, and the right plunger punches a dash. no TELEGRAPH ENGINEERING The punching operator uses a rubber-tipped mallet ineach hand for depressing the plungers. The…
Telegraph
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