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 4 of a calculation, showing the steps to find a final dimension in mm and inches.
| Identifier | ExFiles\Box 28\5\ Scan102 | |
| Date | 26th April 1917 | |
| R.R. 235A (500 T) (S.D. 408. 26-4-17.) Bm. 2/156/13. -4- Contd. = √(51 x .2504)² + 2 x 104 - 75 x .2504. = √163.07 + 208 - 18.78 = 19.26 - 18.78 = .48 mm. = .019" ═════════════════════ EFC. | ||