The specification for B.V. Gearbox No.12 and its use in car 3.B.50.
| Identifier | ExFiles\Box 111\3\ scan0123 | |
| Date | 26th July 1939 | |
| 8006, 663 & H28 To HPS {Horace Percy Smith - Experimental Factory Mgr} /RH. {R. Hollingworth} from Rm {William Robotham - Chief Engineer} /Gry. {Shadwell Grylls} Rm {William Robotham - Chief Engineer} /Gry. {Shadwell Grylls} 6/MW.26.7.39. B.V. GEARBOX NO.12. We understand you will shortly be building this gear-box and should like its specification to be the same as box No.11 except that the 2nd. speed should not have anti-rattle plungers. The 2nd. speed cones should, of course, have the correct cam angles. Gearbox No.12 is, of course, required for 3.B.50, after which a further new box, No.13a will be required for Hs {Lord Ernest Hives - Chair} ' car. 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).