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Optical Telegraph Codes ( Geheimschrift und Zeichensprache )
The coding techniques that were de veloped by Claude Chappe for use on the first French optical telegraph network from the late eighteenth century . The codes are then compared with an independently… Expand
The Use of Optical Telegraphs in England and Elsewhere ( Die optis-che Telegraphie in England und anderen L̈andern )
Not long after Claude Chappe had successfully demonstrated the feasibility of optical telegraphy in France in 1794, the go vernments of most countries in Europe recei ved and solicited proposals for… Expand