Signals Received on 2.5 KR Cable at 175 Letters a Minute, with Various Types of Receiving Circuits. Signals are Full Sizedetail (omitting circuit diagrams yielding examples B through H),
ex Submarine Telegraphy, Part I. Instruction Paper prepared by The Engineers of the Western Union Telegraph Company. American School of Correspondence. Chicago, 1920
University of California copy, digitized October 16, 2007
The clean "block" signals in example A above are not so different from the "Estienne form" Morse type designed by Legros and Grant (1914), shown in preceding post.
Cable operators were adept at reading siphon recorder signals such as these, as they were laid down on the tape. See discussion of siphon recorders in the Encyclopaedia Britannica (1911).
See also the important overview by J. W. Milnor, his "Submarine Cable Telegraphy." A.I.E.E. Transactions (February 1922) : 20-38
22 March 2013
tags: alphabet; curves; lines; telegraphy, submarine; wandering zero