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Foreword Chapter 1 Electricity
Magnetism and Magnets
12 other sections not shown
alternating current ampere of current armature coil arranged attract brushes Canadian Pacific Railway carbon carrier current cause cells of battery choke coil coil of wire combined telegraph Commercial Cables Company condensers connected contact points copper plate cuit current flowing current of electricity current passes diagram diaphragm dynamo effect electric current electrified electromagnet fall back field magnets Figure four wires frequencies galvanometer induction coil instrument insulated International System iron core leakage line wires measure milliamperes Morse motor multiplex mutilation of signals negative number of channels º º obtain Ohm's law ohms operation piece pointer pole line positive Postal Telegraph Postal Telegraph-Cable Co pressure radio repeater repeating coil repel resistance result rheostat ripples rotate shaft simplex circuit ſº sounder station storms strength tele telegraph and telephone telegraph circuits telegraph signals telephone circuit telephone signals terminal tions transmission transmitted varying voltage volts waves Wheatstone bridge zero line zinc plate