From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Drawing of a Wöhler test piece (N.P.L.) with dimensions and specifications.
| Identifier | ExFiles\Box 132\1\ scan0025 | |
| Date | 18th April 1927 guessed | |
| 1.75" 2 7/16" 1.25" A .1" .375" DIA. .5 DIA .312 DIA. .025"R.{Sir Henry Royce} O .65" DIA 1.05" A 2.288" .428 5 7/16" Dimensions underlined must be exact The remainder ± .001" Smooth finish all over 1 LB. ON HANGER AT A-A = 0.5 TONS/SQ" AT NECK O-O WÖHLER TEST PIECE* (N.P.L.) | ||