Laboratory report showing a photograph of a universal joint pin after etching on the needle race.
| Identifier | ExFiles\Box 87\3\ scan0095 | |
| Date | 16th August 1937 | |
| ROLLS-ROYCE LABORATORY REPORT: H1/EJW.4/JN.16.8.37. M 1,389 X 3 UNIVERSAL JOINT PIN GB.2311. AFTER ETCHING ON NEEDLE RACE. | ||
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).