Marconi radio apparatus
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Marconi radio apparatus
Marconi radio equipment with headphones. This is a Marconi Marine Receiver No. 4b. It has two valves and a tuner covering all wavelengths between 300 and 28, 000 metres. It can be fitted with a crystal detector in an emergency. Thermionic valves (also called vaccum tubes) and crystal detectors, were two types of radio technology. Marconi patented his radio equipment in 1896. His initial aim had been to allow communication with those at sea. Photographed for The March of Commerce (1927), volume 4 of The Pageant of America: A Pictorial History of the United States. This was a 15-volume series that commemorated 150 years since the founding of the USA in 1776
Science Photo Library features Science and Medical images including photos and illustrations
Media ID 6431237
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1900s Apparatus Boat Communication Communications History Of Science Radio Receiver Ship Telecommunication Telecommunications The March Of Commerce The Pageant Of America Wireless Mono Chrome Tuner
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