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Summary
| Description |
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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This work is in the public domain in its country of origin and other countries and areas where the copyright term is the author's life plus 70 years or fewer.  You must also include a United States public domain tag to indicate why this work is in the public domain in the United States.
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| This file has been identified as being free of known restrictions under copyright law, including all related and neighboring rights. | |
File history
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 06:04, 4 June 2009 | | 531 × 156 (72 KB) | Mireut | (...inkscape 4.6) |
| 05:06, 4 June 2009 |  | 531 × 156 (80 KB) | Mireut | (plain svg) | |
| 04:40, 4 June 2009 |  | 531 × 156 (86 KB) | Mireut | {{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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