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).
Test report observations on machine silence and tangential force on a cam lever.
| Identifier | ExFiles\Box 65\3\ scan0025 | |
| Date | 26th May 1927 guessed | |
| -6- (16) Remarks re silence of operation :- Very quiet machine. Slight contact breaker noise noticeable. (17) Tangential force to advance cam lever:- 1.0 lb wt. | ||