Technical sketch of two parts, RM-535 and RM-537, with instructions for drilling holes.
| Identifier | ExFiles\Box 97\4\ scan0136 | |
| Date | 10th November 1938 | |
| DRILL 4 HOLES .125 DIA. 11.800 DIA. P.C. HOLES EQUALLY SPACED, BUT ANGULAR POSITION IMMATERIAL RM {William Robotham - Chief Engineer} -535 RM {William Robotham - Chief Engineer} -537 10-11-38 WAP | ||
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).