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History
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Upper-quadrant signal on the Santa Fe Railroad, 1943. The vertical position indicates a "clear" aspect.
Upper-quadrant signal on the Santa Fe Railroad, 1943. The vertical position indicates a "clear" aspect.
Lower-quadrant stop signals at St. Erth in 2007
Lower-quadrant stop signals at St. Erth in 2007
Somersault signals at Carrickfergus railway station, showing the distinctive central pivot about which the arm "somersaults"
Somersault signals at Carrickfergus railway station, showing the distinctive central pivot about which the arm "somersaults"
Signals on the River Weaver Navigation, directing boats into the paired locks
Signals on the River Weaver Navigation, directing boats into the paired locks
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Sailor with signal lamp
Sailor with signal lamp
Heliograph
Heliograph
Electric telegraph
Electric telegraph