Search results
Results From The WOW.Com Content Network
Collins conducting experiment to use a human brain as a radio wave detector. Collins professional interests focused on radio, an exciting technology which was in its early stage during his lifetime. Heinrich Hertz had discovered radio waves in 1887, and Guglielmo Marconi developed the first practical radiotelegraph transmitters and receivers in ...
The radio, instead of relying on batteries or external electrical source, is powered by the user winding a crank. This stores energy in a spring which then drives an electrical generator . Baylis invented it in response to the need to communicate information about AIDS to the "people of Africa". [ 1 ]
The first radio receivers invented by Marconi, Oliver Lodge and Alexander Popov in 1894–5 used a primitive radio wave detector called a coherer, invented in 1890 by Edouard Branly and improved by Lodge and Marconi. [1] [6] [9] [12] [16] [17] [18] The coherer was a glass tube with metal electrodes at each end, with loose metal powder between ...
The crystal detector was the most successful of many detector devices invented during this era. The crystal detector evolved from an earlier device, [40] the first primitive radio wave detector, called a coherer, developed in 1890 by Édouard Branly and used in the first radio receivers in 1894–96 by Marconi and Oliver Lodge.
It was further developed by Guglielmo Marconi, then replaced about 1907 by crystal detectors. In 1890, Branly [ 5 ] [ 6 ] [ 7 ] demonstrated what he later called the "radio-conductor", [ 8 ] which Lodge in 1893 named the coherer , the first sensitive device for detecting radio waves. [ 9 ]
May 1895: After reading about Lodge's demonstrations, the Russian physicist Alexander Popov builds a "Hertzian wave" (radio wave) based lightning detector using a coherer. November 1895: Jagdish Chandra Bose sets up a demonstration of radio microwave at the Town Hall in Calcutta where he ignites gunpowder in a nearby room and rings a bell. [30]
After radio communication was developed Lodge's lecture would become the focus of priority disputes over who invented wireless telegraphy (radio). His early demonstration and later development of radio tuning (his 1898 Syntonic tuning patent) would lead to patent disputes with the Marconi Company. When Lodge's syntonic patent was extended in ...
The early history of radio is the history of technology that produces and uses radio instruments that use radio waves. Within the timeline of radio, many people contributed theory and inventions in what became radio. Radio development began as "wireless telegraphy". Later radio history increasingly involves matters of broadcasting.