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Walter Hans Schottky (German: [ˈvaltɐ ˈʃɔtki]; 23 July 1886 – 4 March 1976) was a German physicist who played a major early role in developing the theory of electron and ion emission phenomena, [2] invented the screen-grid vacuum tube in 1915 while working at Siemens, [3] co-invented the ribbon microphone and ribbon loudspeaker along with Dr. Erwin Gerlach in 1924 [4] and later made ...
Nikola Tesla publicly demonstrated the first wireless remote control of a model ship. 1899: The dog "Nipper" is used in " His Master's Voice ", the trademark for gramophones and records. 1901: The Spanish engineer Leonardo Torres Quevedo began the development of a radio control system, which he called Telekino , to test dirigible balloons of ...
Marconi technician Peter Wright, a British scientist and later MI5 counterintelligence officer, ran the investigation. [9] He was able to get The Thing working reliably with an illuminating frequency of 800 MHz. The generator which had discovered the device was tuned to 1800 MHz.
This camera also used Nikon F-mount lenses, which meant film photographers could use many of the same lenses they already owned. Digital camera sales continued to flourish, driven by technology advances. The digital market segmented into different categories, Compact Digital Still Cameras, Bridge Cameras, Mirrorless Compacts and Digital SLRs.
That mental model was crucial to the successful development of electromechanical devices which were to dominate the 19th century. His demonstrations that a changing magnetic field produces an electric field, mathematically modeled by Faraday's law of induction , would subsequently become one of Maxwell's equations .
First patent on foil electret microphone by G. M. Sessler and J. E. West (pages 1 to 3) West was born on February 10, 1931, in Farmville, Prince Edward County, Virginia as the elder of two children to Samuel Edward and Matilda West. He was born in his maternal grandfather's house because the local hospital would not admit Black people.
Heinrich Rudolf Hertz (/ h ɜːr t s / HURTS; German: [ˈhaɪnʁɪç hɛʁts]; [1] [2] 22 February 1857 – 1 January 1894) was a German physicist, who first conclusively proved the existence of the electromagnetic waves predicted by James Clerk Maxwell's equations of electromagnetism, laying the foundation for the radio and modern telecommunications.
David Edward Hughes (16 May 1830 – 22 January 1900), was a British-American inventor, practical experimenter, and professor of music known for his work on the printing telegraph and the microphone. [3]