controlled beam of sunlight to a distant station to be used as a marker for geodetic survey work, and was suggested as a means of telegraphic communications. [ ] this is the first reliably documented heliographic device, [ ] despite much speculation about possible ancient incidents of sun-flash signalling...
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source of memories in collaboration with and more collections the lifeline of a nation stories from over years of the indian railways the journeys explore dramatic routes and stunning scenery the people meet the everyday heroes who keep the trains running the heritage discover how railways have shaped...
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