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).
Process sheet for a sand casting, detailing the pattern number and machining operations.
| Identifier | ExFiles\Box 171\3\ img163 | |
| Date | 3rd May 1921 guessed | |
| MACHINE TOOL TOOL No CS940 SAND CASTING USE PATTERN G3736 x 3426 501109 DRILL 1.437-5 DIA TAP 1.500 DIA | ||