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Description
Heliographs are comprised of a bright light
source, large reflector, focusing tube and tinted glass lenses.
Messages are transmitted by color coding or on-off Morse code
signaling (usually achieved by covering and uncovering the light
source).
Heliographs are line-of-sight communications
systems and can be obstructed by terrain features, inclement weather
and similar blockages. Distance to horizon is generally the
practical maximum operation range on any given planet (unless
communications are being directed from one mountaintop to another or
are being sent overhead).
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