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).
Sending 24 test pieces to stores and requesting a number for an R.A.F. alloy.
| Identifier | ExFiles\Box 37\4\ scan 122 | |
| Date | 2nd July 1917 | |
| Mr. Clark. X.3040 2.7.17. 24 test pieces sent to Stores. 12 marked M3. X.2746 12 " M4. X.3040 X.3039 Please send number for R.A.F. alloy. EF/CAT29.6.17. (Sgd) A.K. | ||