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).
Blueprint cross-section of a Dunlop Double Lift Jack with handwritten annotations.
| Identifier | ExFiles\Box 48\1\ Scan022 | |
| Date | 9th February 1927 | |
| DUNLOP DOUBLE LIFT JACK 1.50" MORE HAND ADJUSTMENT IS REQUIRED. THRUST RACE HERE WOULD REDUCE EFFORT REQ'D TO OPERATE JACK ROLLS-ROYCE, LIMITED, PRINT ROOM 9 FEB 1927 DERBY THIS LOCKING RING IS FORCED OUT AFTER 2ND STAGE LIFT IS COMPLETED, AND THESE LUGS ALSO ARE STRAIGHTENED OUT CASE COULD BE MADE IN ALUMINIUM. THRUST RACE HERE WOULD REDUCE EFFORT REQUIRED 7227 | ||