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A comment on Email in the 18th century: the optical telegraph. Parent comment
"Telegraph, Perfection of the, in Franch" <https://www.google.com/books/edition/Encyclopaedia_Perthensi...> (1816)
"M. Chappe Laine's History of the Telegraph" <https://www.google.com/books/edition/Articles_and_correspond...> (1826)
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"Telegraph, Perfection of the, in Franch" <https://www.google.com/books/edition/Encyclopaedia_Perthensi...> (1816)
"M. Chappe Laine's History of the Telegraph" <https://www.google.com/books/edition/Articles_and_correspond...> (1826)