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).
Balancing factors and experiments, including a handwritten note and sketch.
| Identifier | ExFiles\Box 25\3\ Scan044 | |
| Date | 25th February 1912 | |
| (3) Owing to the small width of this disc, the out of running-balance factor would be extremely small and practically negligible. The coronation rattles with this scheme were exactly the same as far as could be determined as with the standard brake drum corrected for standing balance. (S) This experiment I believe has an important bearing on the suggested theory, providing it is assumed that the out of running-balance couple with constant velocity with this disc was negligible. [Handwritten Note 1 with sketch] 1st Axis [Sketch shows a central axis point. Above it is a weight 'O 2 lbs.' at a distance '10'. Below it is a weight 'O 1 lb.' at a distance '20"'.] What we meant to convey by my previous note is explained by the above sketch suggested by Mr Royce. This will be in perfect balance as long as it runs at a uniform speed but if the speed changes it will be seen that the force necessary to alter the speed of both pieces is not the same. OH [Handwritten Note 2] This matter is clear up now. In first instance wrong impression was received by works. JWR | ||