Telegraph engineering : a manual for practicing telegraph engineers and engineering students (1922)
Hausmann, Erich, 1886- · New York : D. Van Nostrand Company · leaf 138
e isadvanced a distance commensurate with the space occupiedby the letter or figure. After about 60 letters are punchedan indicator lamp illuminates giving a warning that theend of a Hne (on the receiving page) is approaching. Thepointer, which indicates the number of letters perforated,is returned… … Fig. 12. ing system is a Wheatstone transmitter, or high-speed pole-changer, as described in § i. A front elevation of the upperportion of this transmitter is shown in Fig. 13, whereinmost of the letters refer to the same parts as in Fig. 3.
Telegraph
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