Etching of Alexandre-Stepanovich Popov (1859-1905). Popov studied at St Petersburg University and became a profesor there in 1901. Independently of Guglielmo Marconi (1874-1937), he invented wireles telegraphy in 1896. He was the first person to use a suspended wire as an aerial, and he also introduced choking coils to neutralise the effect of local sparks. Published by the International Telecommunication Union (1955-1964). Dimensions (overall): 230mm x 190mm.
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