National Telegraphic Union · New York : N.T.U. · leaf 252
telegraphers who still prefer the button re-peater to any other, in consequence of its simplicity, con-venience and entire reliability under all circumstances,when properly attended to. The arrangement of buttons and connections for thisrepeater, shown in the annexed diagram, is the one de-vised by… … ence of explanation. M and M are the eastern andwestern relays, S and QJ the eastern and western sound-ers. The local connections are not shown, but are runas usual. The eastern and western main batteries areshown at B and B7, and are placed with opposite polesto the ground, at the repeating…
Telegraph
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