MAKE A MEME View Large Image 1843 polytechnischesjournal t9 f29f30.svg en Diagrams of the third improvement from the specification of the English patent granted to Robert Wornum February 15 1842 reproduced from the Repertory of Patent Inventions October 1842 in ...
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Keywords: 1843 polytechnischesjournal t9 f29f30.svg en Diagrams of the third improvement from the specification of the English patent granted to Robert Wornum February 15 1842 reproduced from the Repertory of Patent Inventions October 1842 in Dingler's Polytechnisches Journal 1843 Figs 29 30 Plate 9 p 479 described in Verbesserungen an Pianofortes worauf sich Robert Wornum Klaviermacher in London am 15 Febr 1842 ein Patent ertheilen liess Aus dem Repertory of Patent-Inventions Okt 1842 S 225 Johann Gottfried Dingler Polytechnisches Journal vol 87 J G Gotta Stuttgart 1843 http //books google com/books id X_c0AAAAMAAJ jtp 452 p 452-454 Robert Wornum reproduction of patent drawing uncredited and not signed 1842 http //books google com/books id X_c0AAAAMAAJ jtp 479 Fig 29 y Damper axis; z spring Fig 30 A damper axis; B damper spring; C hammer axis; D vertical wire PD-old Piano action Polytechnisches Journal
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