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adjusted apparatus armature lever arrangement Automatic blue vitriol boards 50 Brevet bridge button repeater cable charge chemical circuit changer closed cloth condenser connected copper core diagram distant station drum duplex earth eastern main circuit eastern relay edition Electric Telegraph electricity electro-magnet engravings extra local circuit extra local magnet false break galvanometer governor magnet Hypsometry i8mo Illustrated inductive instant insulated invented iSmo line wire local battery main battery main line manner method Morse needle Newfoundland ohms operation opposite ordinary relay paper PLATE polarity poles porous cup Practical Prof quadruplex receiving instrument receiving relay relay armature relay magnet repeating points screw short circuit shown shunt side signals sounder levers spring static Steam Engine Stearns strength switch T. A. Edison Telegraph Terminal Station thence tion transmitter Treatise U. S. Navy western circuit western relay Western Union wood cuts zinc