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).
List of balance calculations for centre and end units.
| Identifier | ExFiles\Box 138\1\ scan0079 | |
| Date | 21th November 1933 | |
| -2- Hs{Lord Ernest Hives - Chair}/Gry.{Shadwell Grylls}14/KT.21.11.33. LeC.3660. Expl. (1) Out of balance of centre unit. 16.6 lbs.in2 9.96 (2) Out of balance of end unit in direction of Nos. 3 & 4 pins. 14.4 10. (3) Balance of centre unit. 10.6 64% 9.96 100% (4) Balance of end units. 9.2 10. Hs{Lord Ernest Hives - Chair}/Gry.{Shadwell Grylls} | ||