Request for figures regarding the efficiency of an Acme oil thread on a Wraith first motion shaft.
| Identifier | ExFiles\Box 8\11\ 11-page126 | |
| Date | 28th June 1938 | |
| 628 To HPS {Horace Percy Smith - Experimental Factory Mgr} /W.Bell. from Rm {William Robotham - Chief Engineer} /Gry. {Shadwell Grylls} Rm {William Robotham - Chief Engineer} /Gry. {Shadwell Grylls} 8/MH. {M. Huckerby} 28.6.38. OIL RETURN THREADS. Confirming our conversation with you we should like figures to show whether the efficiency of the Acme oil thread such as on a Wraith first motion shaft varies with annular gaps between .001 and .010 or is reduced because it touches one side of the housing. Will you please get this information as soon as possible. Rm {William Robotham - Chief Engineer} /Gry. {Shadwell Grylls} | ||
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).