English: Diagrams of the second and first improvements from the specification of the English patent granted to Robert Wornum, dated February 15, 1842; traced and colorized by User:Mireut
Date
Source
Fig. 4, sheet 3, from Robert Wornum "Improvements in the action of pianofortes" English patent no. 9,262 February 15, 1842
Author
Robert Wornum
a, key; b, hammer; d, hammer return spring; k, spring lever; l, strap of leather; m, hammer rail; n, rocking lever; p, projection; q, hopper; s, damper wire; v, damper lever; w, damper lever axis
Licensing
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{{Information |Description={{en|1=Diagrams of the second and first improvements from the specification of the English patent granted to Robert Wornum, dated February 15, 1842; traced and colorized by User:Mireut}} |Source=Fig. 4, sheet 3, from Robert
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