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).
Listing atmospheric factors needed to formulate the law of horsepower variation.
| Identifier | ExFiles\Box 37\3\ scan 125 | |
| Date | 13th September 1917 guessed | |
| Contd. -2- three factors, (1) Barometer reading. (2) Atmospheric temperature reading (dry bulb thermometer). (3) Reading of wet bulb thermometer. for varying atmospheric states, but for constant engine conditions. If sufficient of these are obtained, we shall be able to formulate not only the law of variation of horse power with humidity, but also the true way in which the horse power varies with atmospheric temperature and pressure. We return a copy of the letter which you sent to us. EFC. | ||