asfaltics + telegraph.manuals   1

Elements of Telegraph Operating
— elementary telegraphy, telegraphy, telegraph repeaters, power equipment (Scranton: International Textbook Company, 1913) ¶ opens to pp58-59, showing example of a siphon recorder message (also block signal presentation of the cable morse alphabet)
telegraph.manuals  telegraphy 
october 2009 by asfaltics

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