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 weight required to overcome spring tension in single and double lift hydraulic jacks.
| Identifier | ExFiles\Box 139\2\ scan0239 | |
| Date | 7th May 1935 | |
| X3117 To Da.{Bernard Day - Chassis Design} c. to Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} Hs{Lord Ernest Hives - Chair}/Bwg.{J. C. Bowring}13/KW.7.5.35. Hydraulic Jacks. Below we give figures showing weight required to overcome spring tension in the single and double lift Jacks as on 28-EX. Double Lift Ram. lbs. Weight Extension of Jack in inches. 50 1.500" 100 4.500" 150 7.00" 200 9.625" (Max.) Single Ram. 50 4.500" 100 9.125" (Max.) These figures show that it is impossible for the Jacks to "work down" on their own accord, providing the return spring remains intact. Hs{Lord Ernest Hives - Chair}/J.Bowering. | ||