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adjustment aerial alternating current ampere arc lamp armature arrangement battery bichromate cable camera cell S2 circuit breaker coherer coil complete condenser conducting strip connected consists contact breaker cylinder damped waves detector diagram diameter diaphragm distance Drawing driving motor ebonite Einthoven galvanometer electric electrical resistance electro-magnet fastened flows foil given in Fig glue high speed inch inductance inertia insulating Isochroniser lamp lens light line print magnet means mercury metal print method minutes mirror movement needle negative Nernst lamp Nicol prism obtained passing photo-telegraphy photographic film placed portion prepared Professor Korn radio-photography received picture receiving apparatus receiving station regulated resistance revolution revolving revolving film round the drum screw selenium cell sensitive shaft sheet shown in Fig signals spark spark-gap spring steel point stylus switch synchronising telephone relay thread trans transmission of photographs transmitting apparatus transmitting machine tube vibrates waves wire wireless telegraphy wireless transmission