Wireless telegraphy: Heaviside layer, a layer of the earth's atmosphere containing electrons, has a more or less free state. Anonymous illustration from 1925. Private collection.(Wireless telegraphy: Heaviside layer, a layer of the earth's atmospere containing electrons, has a more or less free state. Anonymous illustration from 1925. Private collection.)Anonymous Anonymous |
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Undated · Engraving
· Picture ID: 925467
colour · colours · engraving · physical · communication · knowledge · telegraph · world · wireless telegraph (t.s.f.) · 20 20th 20th xx xxth 20th century · bianchetticor · Private Collection / Bridgeman Images |
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