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Description
"Poulsen Valdimar. Photo. No. 1." "Receiver for first amateur radio in the world, using galena chrystal and graphite point. On right, experimental model (1909). Attempting to make four lead vacuum tube for transmitting." Caption by Douglas Perham, part of a series of pictures from an exhibition regarding "the first amateur station in the world, by Einar Dessau, in Copenhagen, Denmark, in 1907."
Type
image
Format
Black & White
Identifier
99101557-8540-47D9-9C32-366480238000 2003-37-178
Subject
Federal Telegraph Company Poulsen arc transmitter Amateur radio stations--History (LCSH) Radio--Receivers and reception (LCSH) Radio--Transmitters and transmission (LCSH) Vacuum-tubes (LCSH) Galena (LCSH) Crystal sets (Radio) (LCSH) Dessau, Einar
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