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).
Letter discussing design suggestions for a piston and tube assembly, including thoughts on threads and floating components.
| Identifier | ExFiles\Box 180\M6\ img056 | |
| Date | 3rd December 1927 | |
| WBS West WitteringHenry Royce's home town. 3/12/27 My dear Mr Bentley, I think you will get the 3 phase Solenoid all right very soon now; my suggestions <strike>are</strike>. I had thought of the single thread and tube to hold the piston but feared that it would result in the tube being bent through the faces of the tube or piston collet, being slightly out of truth; if we could use a pair of spherical surfaces, just under the ^upper piston. & or we could ensure the nut being only hand tight (knurled ^and gold pinned), it would be fairly safe, if you could avoid it being screwed up with gas pliers, We do not yet know how slack the piston can be. it might require a clearance which would avoid the necessity of floating. My impressions are about these designs, they must be fool proof, they must (when reasonably well machined) be capable of being put together once for all without fitting, and it is better to be ^thoroughly certain to obtain this result, than save a little machine work on parts in the first instance. I enclose a sketch showing the spherical surface suggested above. if correctly made, with floating washer. I believe the spindle could not be bent, there is no extra piece, the convex surface could be on the enlarged end of the tube if desired, I think I should use <strike>FJG</strike> Fig 2 floating piston until I know more. PTO | ||