The Marconi International Marine Communication Company, also referred to as Marconi Marine, was a maritime communications company and a subsidiary of the Marconi Company. Founded in 1900, the company
Spark-gap transmitter on board the SS Minnetonka, c. 1902
Marconi coastal station in Carnarvon, Wales
Marconi coastal station in Malin Head, Ireland, c. 1902
Spark-gap transmitter
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A spark-gap transmitter is an obsolete type of radio transmitter which generates radio waves by means of an electric spark. Spark-gap transmitters were the first type of radio transmitter, and were th
Low-power inductively coupled spark-gap transmitter on display in Electric Museum, Frastanz, Austria. The spark gap is inside the box with the transparent cover at top center.
Demonstration of the restored 1907 Massie Wireless Station spark gap transmitter Audio of Massie spark gap transmission Morse code of "CQ DE PJ"
Hertzian spark oscillator, 1902. Visible are antenna consisting of 2 wires ending in metal plates (E), spark gap (D), induction coil (A), auto battery (B), and telegraph key (C).
Jagadish Chandra Bose in 1894 was the first person to produce millimeter waves; his spark oscillator (in box, right) generated 60 GHz (5 mm) waves using 3 mm metal ball resonators.