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English: 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
Date
Source 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 p.452-454
Author Robert Wornum (reproduction of patent drawing, uncredited and not signed)
Other versions https://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

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