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).
Modifications and design improvements for a Dunlop Jack.
| Identifier | ExFiles\Box 48\1\ Scan009 | |
| Date | 13th December 1924 | |
| X4124 To Hs {Lord Ernest Hives - Chair} from RHC. {R. H. Coverley - Production Engineer} RHC {R. H. Coverley - Production Engineer} 4/BE. 13.12.24. RE DUNLOP JACK. With reference to Dunlop Jack which you have requested should be reduced in height by .500". This was done by milling the base and reducing the length of Lifting Screws. On examination we found in the top thrust 6 broken balls. These balls are .125" dia. and are much too small to take the load. We suggest that thrust balls should not be less than .250 dia. which will necessitate certain alterations to design. RHC. {R. H. Coverley - Production Engineer} | ||