Discussion:Pyrophone
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The pyrophone must have been invented / created before 1875 because there is an article about it - together with two illustrations - on pages 403, 404 & 405 of L’Exposition Universelle de Vienne 1873 (Issue 26 of 13 September 1873)
A copy of The Journal can be found on-line at https://books.google.co.uk/books/about/Exposition_universelle_de_Vienne_1873.html?id=aRNZAAAAcAAJ&redir_esc=y