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).
Request to recalibrate the speedometer and check the hodometer for car 3.B.50 due to a change in the rear axle ratio.
| Identifier | ExFiles\Box 165\2\ img191 | |
| Date | 6th May 1939 | |
| To HPS{Horace Percy Smith - Experimental Factory Mgr}/WSC.{W. S. Cassel} c. to Rm{William Robotham - Chief Engineer}/RC{R. Childs}/CAP. 6065 Rm{William Robotham - Chief Engineer}/RC.{R. Childs}5/JH.6.5.39. SPEEDOMETER OFF CAR 3.B.50. Owing to the rear axle on car 3.B.50. being changed from a temporary one with a ratio of 9/37 to the proper one with a ratio of 11/41 the speedometer for this car needs re-calibrating. Will you, therefore, please arrange for Bentley instrument No.2183 to be sent to the makers and the calibration altered from its present value of 700 revs/mile to 640 revs/mile. At the same time the makers should be asked to give attention to the hodometer portion of the instrument as this appears to be very incorrect. Rm{William Robotham - Chief Engineer}/RC.{R. Childs} | ||