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History
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Fig. 1: Signaling with a Mance heliograph, Alaska-Canada border, 1910.
Fig. 1: Signaling with a Mance heliograph, Alaska-Canada border, 1910.
Fig. 2: German heliograph made by R. Fuess in Berlin (on display at the Museum of Communication in Frankfurt)
Fig. 2: German heliograph made by R. Fuess in Berlin (on display at the Museum of Communication in Frankfurt)
Fig. 3 Ottoman heliograph crew at Huj during World War I, 1917
Fig. 3 Ottoman heliograph crew at Huj during World War I, 1917
Ruins of German Schutztruppe on top of Dikwillem, where the Germans used to have a Heliographic Station (Bird's eye view 2017)
Ruins of German Schutztruppe on top of Dikwillem, where the Germans used to have a Heliographic Station (Bird's eye view 2017)
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This Morse key was originally used by Gotthard railway, later by a shortwave radio amateur
This Morse key was originally used by Gotthard railway, later by a shortwave radio amateur
Single needle telegraph instrument
Single needle telegraph instrument
Telegraph key and sounder. The signal is "on" when the knob is pressed, and "off" when it is released. Length and timing of the dits and dahs are enti
Telegraph key and sounder. The signal is "on" when the knob is pressed, and "off" when it is released. Length and timing of the dits and dahs are entirely controlled by the telegraphist.
Morse code receiver that records on paper tape
Morse code receiver that records on paper tape