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acid adjustment aerial tuning inductance alternating current amount amperes apparatus armature arrangement back E.M.F. battery brass brushes buzzer capacity cell closed oscillatory circuit commutator conductor connected contained copper coupling curve diagram difference of potential direct current direction disc discharger dynamo earth arrester ebonite electricity electro-magnet electrodes field regulator fixed galvanometer handle increase induced E.M.F. induction coil insulation iron core jigger jigger secondary k.w. set lamp Leading-in lines of force machine magnetic detector manipulating key Marconi Marconi Company maximum means metres mhys microhenrys motor multiple tuner negative number of turns obtained Ohm's Law oscillations parallel piece Plain Discharger plug pole position potentiometer primary winding produced receiving circuit resistance rotation screw shown in Fig shunt signals socket spark gap specific gravity starter studs supplied switch switchboard telephone terminals transformer transmitting tube valve voltage voltmeter volts wave length wire wireless zinc