The specifications for B.V. Gearbox No. 12.
| Identifier | ExFiles\Box 99\4\ scan0231 | |
| Date | 26th July 1939 | |
| 428, 8006 & 663 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/MH. {M. Huckerby} 26.7.39. B.V. GEARBOX NO.12. We understand you will shortly be building this gearbox 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.13, 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).