Image: Schilling one-needle telegraph
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Description: One needle instrument from Schilling's telegraph
Title: Schilling one-needle telegraph
Credit: J.J. Fahie, A History of Electric Telegraphy, to the Year 1837, London: E. & F.N. Spon, 1884
Author: John Joseph Fahie (1846-1934)
Usage Terms: Public domain
License: PD
Attribution Required?: No
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