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).
Continued page of a report on the testing and weight comparison of duralumin and steel rocker arms.
| Identifier | ExFiles\Box 37\3\ scan 046 | |
| Date | 18th October 1917 guessed | |
| -2- Contd. duralumin rocker arms. They have been run on test engines for about 30 hours quite satisfactorily. The weight of the duralumin arm is .011 lbs. The steel one weighs .023 lbs. EHC | ||