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).
Postscript clarifying that expander unit parts were machined freehand and that future production will adhere to print dimensions.
| Identifier | ExFiles\Box 120\2\ scan0304 | |
| Date | 25th April 1938 | |
| - 2 - Messrs. Rolls Royce Ltd., 25th April, 1938. P.S. Kindly understand that the parts of this expander unit were machined free hand as we had not the necessary jigs. Production, of course, would definitely be to dimensions shown on our print. | ||