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Edwin Howard Armstrong, American electrical engineer, c 1940

IMAGE number
UIS5072677
Image title
Edwin Howard Armstrong, American electrical engineer, c 1940
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Location
Science Museum, London, UK
Medium
engraving
Image description

Edwin Howard Armstrong, American electrical engineer, c 1940. Etching of Armstrong (1890-1954) who was born in New York City and studied at Columbia University where he invented the regenerative circuit. This which was the first amplifying receiver and reliable continuous-wave transmitter. In 1918, he devised the superheterodyne circuit, which provided a highly selective means of receiving, converting and amplifying weak, high-frequency electromagnetic waves. Finally, in 1933, he invented the wide-band frequency modulation radio transmission system (now known as FM radio), which he perfected, virtually eliminating interference problems from static. Published by the International Telecommunication Union, (1955-1964). ©SSPL/Science Museum

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SSPL/UIG / Bridgeman Images
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Largest available format 2490 × 3504 px 2 MB
Dimension [pixels] Dimension in 300dpi [mm] File size [MB] Online Purchase
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