File:Rees's Cyclopaedia - Richard Lovell Edgeworth's optical telegraph.png
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Summary
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English: Fig. 12 from the plate on "Telegraph" in Rees's Cyclopædia, illustrating Richard Lovell Edgeworth'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 | 1802-1820 (serial publication of the source work) | ||||||||||||||||||||||||||||||||||||||||||
| Source | Rees's Cyclopædia, Plates Vol. IV, "TELEGRAPH", Fig. 1 and 2; from a digital scan at https://archive.org/details/cyclopaediaplates04rees | ||||||||||||||||||||||||||||||||||||||||||
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This is a retouched picture, which means that it has been digitally altered from its original version. Modifications: Cropped, adjusted levels, removed "fig. 12", various paper stains and blemishes and digital artifacts, grayscaled. Modifications made by Morgan Riley. The original can be found here: https://archive.org/stream/cyclopaediaplates04rees#page/n325/mode/2up.
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Licensing
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The author died in 1851, so this work is in the public domain in its country of origin and other countries and areas where the copyright term is the author's life plus 100 years or fewer. This work is in the public domain in the United States because it was published (or registered with the U.S. Copyright Office) before January 1, 1931. |
| This file has been identified as being free of known restrictions under copyright law, including all related and neighboring rights. | |
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This work is based on a work in the public domain. It has been digitally enhanced and/or modified. This derivative work has been (or is hereby) released into the public domain by its author, Morgan Riley. This applies worldwide.
In some countries this may not be legally possible; if so: |
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 18:15, 2 February 2013 | | 817 × 323 (46 KB) | Morgan Riley | {{Information |Description ={{en|1=Fig. 12 from the plate on "Telegraph" in Rees's ''Cyclopædia'', illustrating Richard Lovell Edgeworth's proposal for an optical telegraph system in Ireland. Each indicator was used ... |
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