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).
Remarks on silence of operation and tangential force measurements.
| Identifier | ExFiles\Box 43\4\ Scan248 | |
| Date | 21th February 1930 guessed | |
| -6- (17) Remarks re silence of operation :- not necessary, (18) Tangential force :- 4.25 lbs wt. EFC. | ||