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 the B-G-R formula for the quick computation of vibration frequency.
| Identifier | ExFiles\Box 158\4\ scan0046 | |
| Date | 12th June 1936 guessed | |
| -7- VIBRATION FREQUENCY FORMULAS. C. B-G-R FORMULA for quick computation. Accurate enough for most engineering design. Period in vibrations per minute = Sm / 4.777 f f = Deflection in inches from free position of spring. Sm = Stress calculated by Wahl Formula. | ||