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).
Data table for correcting aero engine B.HP to standard pressure.
| Identifier | ExFiles\Box 37\3\ scan 123 | |
| Date | 15th September 1917 | |
| X 3178 15.9.17. CORRECTION OF AERO ENGINE B.H.P. TO STANDARD PRESSURE 29.92" OF MERCURY, ASSUMING B.H.P. TO VARY AS PRESSURE ONLY i.e. TO BE INDEPENDENT OF TEMPERATURE. Barometer Reading. | Corr'n % 28.0 | +6.9 28.1 | +6.5 28.2 | +6.1 28.3 | +5.7 28.4 | +5.3 28.5 | +5.0 28.6 | +4.6 28.7 | +4.25 28.8 | +3.9 28.9 | +3.5 29.0 | +3.2 Barometer Reading. | Corr'n % 29.0 | +3.2 29.1 | +2.8 29.2 | +2.5 29.3 | +2.1 29.4 | +1.8 29.5 | +1.4 29.6 | +1.1 29.7 | + .7 29.8 | + .4 29.92 | + 0 30.0 | -.3 Barometer Reading. | Corr'n % 30.0 | -.3 30.1 | -.6 30.2 | -.9 30.3 | -1.25 30.4 | -1.6 30.5 | -1.9 30.6 | -2.2 30.7 | -2.5 30.8 | -2.85 30.9 | -3.2 31.0 | -3.5 | ||