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).
Modifications and hardness specifications for 25 HP engine mounting rubbers.
| Identifier | ExFiles\Box 104\1\ scan0221 | |
| Date | 3rd October 1934 | |
| X50.T To By.{R.W. Bailey - Chief Engineer} c. to Roy{Sir Henry Royce}: Hs{Lord Ernest Hives - Chair}/Les.22/KW.3.10.34. 25 HP. Engine Mounting Rubbers. The rubbers which are being supplied for production are different in certain respects to our drawings. Will you therefore please have the following drawing brought up to date. F.60398. Shape modified to attached sketch, hardness being Durometer 65-70. F.60399. Durometer Hardness 65-70. F.60351. Durometer Hardness 65-70. F.60517. " " 65-70. F.60351. " " 65-70. F.60364. " " 65-70. F.60354. " " 75-80. Hs{Lord Ernest Hives - Chair}/Les.{Ivan A. Leslie} | ||