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).
Photographic study of crankshaft vibration patterns under various balance conditions.
| Identifier | ExFiles\Box 103\3\ scan0135 | |
| Date | 4th December 1931 guessed | |
| Top Row: Image 1: 2400, No Balance Weights Image 2: 2400, 95% Balance Middle Row: Image 1: 3300, 95% Balance 41 fms at Periphery Image 2: 2400, No Weights 41 fms at Periphery Image 3: 2400, 95% Balance, 41 fms at Periphery Image 4: 3300, 95% Balance Bottom Row: Image 1: 2400, 1 lb in Couple OPPOSING No 6 CRANK Image 2: 2400, No Couple Image 3: 2400, 1 lb IN Couple IN SAME DIRECTION as No 6 CRANK | ||