File:Skrifmaskin, Pratts pterotype, Nordisk familjebok.png
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| Description | Early prototype typewriter, the Pterotype ('winged type'), built by John Pratt, an American living in England, and presented at the Society of Arts in London and the Royal Society, in 1867. An article about it in the July 6, 1867 issue of Scientific American inspired many other typewriter inventors. A unique feature of the machine was that the typefaces were on a 'type plate', which was moved horizontally and vertically by the keys, and a hammer struck the paper from behind, driving it against the type. Pratt received British letter patent no.3163 on Dec. 1, 1866 and US Letter Patent No. 81000 on Aug. 11, 1868. Unable to develop it commercially, Pratt sold the rights to James Bartlett Hammond, and many of it's features were incorporated in the Hammond typewriter. For more information see Appleton's Annual Cyclopedia for 1890, p.809 |
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| Source | https://runeberg.org/nfce/0633.html |
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This image was first published in the 1st (1876–1899), 2nd (1904–1926) or 3rd (1923–1937) edition of Nordisk familjebok. The copyrights for that book have expired and this image is in the public domain, because images had no named authors and the book was published more than 70 years ago.
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This image (or other media file) is in the public domain because its copyright has expired and its author is anonymous.
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Note: In Germany and possibly other countries, certain anonymous works published before July 1, 1995 are copyrighted until 70 years after the death of the author. See Übergangsrecht. Please use this template only if the author never claimed authorship or their authorship never became public in any other way. If the work is anonymous or pseudonymous (e.g., published only under a corporate or organization's name), use this template for images published more than 70 years ago.
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
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| current | 22:53, 6 December 2005 | | 939 × 1,181 (72 KB) | Väsk (talk | contribs) | From http://runeberg.org/nfce/0633.html {{PD-Ugglan}} |
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