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).
Logarithmic pressure-volume indicator diagram showing engine expansion and compression curves.
| Identifier | WestWitteringFiles\K\October1923\ Scan21 | |
| Date | 1st October 1923 guessed | |
| G11 γ (expan) = AB/AC = 12.35/9.85 = 1.255 γ (compn) = A'B'/A'C' = 11.4/8.75 = 1.32 Log Abs. Pressure 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 200, 300, 400, 500, 600, 700 Log Volume FRACTIONS OF STROKE A, A', A'' B, B' C, C' d, d' e, e' f, g, h, j, l, m, n, o, p, q, r Ignition Ats | ||