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).
The performance of special deep groove ball bearings, No. 4747, in the 20 HP clutch withdrawal mechanism.
| Identifier | ExFiles\Box 20\7\ Scan050 | |
| Date | 27th May 1925 | |
| Hs.{Lord Ernest Hives - Chair} X575 BY3/H 27.5.25. We never seem to have heard anything about the three special deep groove ball bearings, No. 4747, which were fitted into the clutch withdrawal mechanism of the 20 HP. The bearings in question were instructed by us in June 1922. The Hoffmann Company are interested as to whether the proposal works satisfactorily or not from our point of view. I have told Mr.Butlin that provided we are not having trouble with our present installation, it is difficult to get us to make a change, but I am pretty certain that you did do some testing in this connection, and I am rather interested in knowing whether it would represent something we could fall back upon if the present scheme gave us trouble. BY.{R.W. Bailey - Chief Engineer} [Signature] | ||