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aerial telegraphy antenna battery boat cable Carlo Alberta coherer communication condenser conduction connected copper wire detector diameter discharge discovery distance Dolbear earth earth-plates effect elec electric waves electromagnetic waves etheric wave exciter experiments feet Flat Holm galvanometer graphy ground Hertz induction coil instrument insulated invention inventor investigations kilometers Lavernock Point length Leyden jar light lighthouse magnetic Mahlon Loomis Marconi mast means ments mercury messages metal plates meters method microphone miles Morse key needle obtained oscillations patent Poldhu poles possible practical Preece's primary circuit Professor receiving apparatus regard relay resistance sending station sensitive ship shore shown in Fig signals Sir Oliver Lodge Sir William spark-gap sparks Steep Holm Steinheil's Story successful surface syntony tance telegraphy without wires telephone terminal tion transmission transmitting tricity Trowbridge tube vertical conductor vertical wire vessels William Preece Wimereux wireless tele wireless telegraphy yards
Internet Archive: Details: The story of wireless telegraphy
Sparks Telegraph Key Review
Stevenson Collection - Rare Books - National Library of Scotland