File:Rees's Cyclopaedia - Richard Lovell Edgeworth's optical telegraph.png
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Summary
Fig. 12 from the plate on "Telegraph" in Rees's Cyclopædia, illustrating <a href="https://en.wikipedia.org/wiki/Richard_Lovell_Edgeworth" class="extiw" title="w:Richard Lovell Edgeworth">Richard Lovell Edgeworth</a>'s proposal for an optical telegraph system in Ireland. Each indicator was used to display the number of a particular unit, to form a four-figure number, which then represented characters and words via a codebook. For further explanatory text, see entry on "TELEGRAPH", volume 35 of the Cyclopædia.
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 19:01, 6 January 2017 | 817 × 323 (46 KB) | 127.0.0.1 (talk) | Fig. 12 from the plate on "Telegraph" in Rees's <i>Cyclopædia</i>, illustrating <a href="https://en.wikipedia.org/wiki/Richard_Lovell_Edgeworth" class="extiw" title="w:Richard Lovell Edgeworth">Richard Lovell Edgeworth</a>'s proposal for an optical telegraph system in Ireland. Each indicator was used to display the number of a particular unit, to form a four-figure number, which then represented characters and words via a codebook. For further explanatory text, see entry on "TELEGRAPH", volume 35 of the <i>Cyclopædia</i>. |
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