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).
Notes on magneto operation noise, identifying the 'make and break' as the noisiest component, and a tangential force measurement.
| Identifier | ExFiles\Box 65\3\ scan0067 | |
| Date | 27th August 1927 guessed | |
| -7- (16) Remarks re silence of operation. Quiet magneto, the noisiest component being the make and break. (17) Tangential force = 2 lbs wt. EFC. | ||