| 11. | The designer described the Solar Beacon as a " heliostat ", not a " heliograph ".
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| 12. | In open warfare, visual signalling ( employing signal flags and the heliograph ) was the norm.
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| 13. | The handy discs can also be used as impromptu heliographs to signal your forces trapped behind federal lines.
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| 14. | The heliograph uses a mirror to Naval ships often use signal lamps and Morse code in a similar way.
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| 15. | However there is little evidence that " heliograph " here is other than a misspelling of " holograph ".
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| 16. | The Grugan and Pursell heliographs used shutters, and the others used movable mirrors operated by a finger key.
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| 17. | The next day a heliograph was spotted signalling from Fort Pearson and a makeshift apparatus allowed Eshowe to reply.
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| 18. | This high point was used by the U . S . Army in the 1880s as a heliograph station.
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| 19. | The Spanish garrison at Igueriben was cut off, but could communicate with the fort at Annual via heliograph.
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| 20. | Other historical exhibits included five heliographs by Ni�pce with modern photographers such as Captain Thomas Honywood also being present.
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