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).
Servo mechanism with a table of applied pressure values.
| Identifier | WestWitteringFiles\K\December1923\ Scan62 | |
| Date | 12th July 1923 | |
| R.R. 492A (40 H) (SL 42 12-7-23). J.H., D.{John DeLooze - Company Secretary} ORIGINAL EXPERIMENTAL REPORT. Expl. No. X9910 REF: Hs{Lord Ernest Hives - Chair}/AEL/C1018.23 To R.{Sir Henry Royce} from Hs{Lord Ernest Hives - Chair}/AEL. c.c. to CJ. c.c. to HG. c.c. to Ds. c.c. to BY.{R.W. Bailey - Chief Engineer} E.A.C.111. SERVO. F = Pressure applied at servo. W = Pressure to be distributed to brakes from servo for corresponding values of F.{Mr Friese} | W lbs. | F lbs. | W/F | |--------|--------|-------| | 116 | 6.25 | 18.5 | | 141 | 7.75 | 18.2 | | 166 | 9 | 18.4 | | 191 | 10 | 19.1 | | 216 | 11.5 | 19.6 | | 241 | 13 | 18.4 | | 266 | 16 | 16.2 | | 291 | 18 | 16.1 | | 316 | 20 | 15.8 | | 341 | 21 | 16.2 | | 366 | 21.75 | 16.8 | | 391 | 23 | 17 | | 416 | 24.25 | 17.1 | | 441 | 25 | 17.6 | | 466 | 26 | 17.9 | Average W/F = 17.5. N.B. F.{Mr Friese} was applied at the same position as when working on a car. | ||