Handbook of Technical Instruction for Wireless Telegraphists

accumulator acid adjusted aerial tuning inductance Æther alternating current ampères apparatus armature arrangement back E.M.F. battery brass brushes capacity cell charge closed circuit closed oscillating circuit commutator conductor connected consists contained copper coupling curve direct current disc discharge dynamo earth arrester ebonite electricity electro-magnet electrodes field regulator fitted fixed galvanometer induction coil insulated iron core jigger lines of force machine magnetic detector magnetic key main condenser manipulating key Marconi Marconi Company marked maximum means microhenries motor multiple tuner number of turns obtained Ohm's law oscillation constant parallel pass piece plates plug pole position primary winding produced receiving circuit resistance rotation screw secondary windings seen shown in Fig shunted slip rings socket spark gap specific gravity spring starter studs supplied switchboard taken takes place telephones terminals tion transformer transmitting tube valve variable condenser voltage voltmeter volts wave length wire wireless zinc