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).
Page detailing an approximate form of an equation for specific values related to air.
| Identifier | ExFiles\Box 36\1\ scan 024 | |
| Date | 21th February 1917 guessed | |
| Contd. -12- An approximate form of the first equation for values of D between 1 and .527 is W = 1.1CA √[P1 (P1 - P2) / T1] * {1 + (P1 - P2) / (2n P1)} (for air) where n = γ = 1.405 | ||