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).
Drawing and calculations for a balance weight.
| Identifier | ExFiles\Box 14\2\ Scan128 | |
| Date | 11th August 1931 guessed | |
| 1 1/4" THICK 13.0" 4.6 lbs MOMENT 11.5 LBS-INS INERTIA = M/2 (a² + x²) 2.3 (3.5 + 16) = 45 LBS-IN² "BALANCE WEIGHT FOR LEC 2925 | ||