Fig. 1 shows the optical telegraph with horizontal beam and two smaller wing beams a later development of the shutter telegraph Fig 2. Date: circa 1810

Fig. 1 shows the optical telegraph with horizontal beam and two smaller wing beams a later development of the shutter telegraph Fig 2. Date: circa 1810
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Image Number: 4220-21870739Rights ManagedCredit Line:Mary Evans Picture Library/Pantheon/SuperStockCollection:Mary Evans Picture LibraryModel Release:NoProperty Release:NoResolution:4461×3166
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