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).
Blueprint showing the correct and incorrect drilling positions for a reduction housing for a tachometer drive.
| Identifier | ExFiles\Box 131\4\ scan0321 | |
| Date | 24th June 1937 | |
| WRONGLY DRILLED. CORRECT POSITION REDUCTION HOUSING FOR TACHOMETER DRIVE. DYNAMO W.3.B.K. JUNE 24TH 37 RM{William Robotham - Chief Engineer}/G.M.H. | ||