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Image: Rees's Cyclopaedia - Richard Lovell Edgeworth's optical telegraph

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Description: 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.
Title: Rees's Cyclopaedia - Richard Lovell Edgeworth's optical telegraph
Credit: Rees's Cyclopædia, Plates Vol. IV, "TELEGRAPH", Fig. 1 and 2; from a digital scan at http://archive.org/details/cyclopaediaplates04rees
Author: John Farey, Jr.
Permission: 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 less. 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, 1923. This file has been identified as being free of known restrictions under copyright law, including all related and neighboring rights.
Usage Terms: Public domain
License: Public domain
Attribution Required?: No

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