National Telegraphic Union · New York : N.T.U. · leaf 140
s are separated fromeach other by a regular and uniform space of the l-600th to thel-800th of an inch, the layers separated by thin paper. In helices 9silk insulated wire, the space occupied by the silk is the l-150th t >the l-300th of an inch ; therefore a spool made of a given length anisize… … Vol. IV—No. 16. New-York, Saturday, December 14, 1887. Whole No. 74. Automatic Telegraphy. BY ALEXANDER BAIN. Automatic telegraphy consists of methods of trans-mitting and receiving previously-composed messages be-tween distant places by means of self-acting machineryin connection with electric…
Telegraph
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