Nikola Tesla - The Founder of High-Frequency and Radio Engineering Page 12

patents 645,576 and 649,621, in which four resonant current circuits were applied and protected for various radio-engineering purposes: two circuits on the transmitting and two circuits on the receiving radio station, with each having one open and one closed circuit.

c) Tesla’s Experiments in the Field of Radio Technology in 1898

Subsequently, in 1898, Tesla extended his wireless experiments to the wireless control of ships and moving objects, specifically at sea,

near New York, he publicly conducted experiments with a small model boat. These experiments were completely successful and demonstrated that, via radiotelegraphy from a small radio station on the shore, it was possible to control the boat at will, without wires and without a crew, solely by means of electromagnetic waves which activated the electrical circuits and