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).
Instruction sheet detailing Specific Gravity and Brinell hardness test results.
| Identifier | ExFiles\Box 37\4\ scan 137 | |
| Date | 26th June 1917 | |
| R.R. 26 (2H.) S.D. 71. 18-12-16. X. 3041 ROLLS-ROYCE LIMITED. INSTRUCTIONS 26.6.1917 To Mr Clark. Order No. Customer's No. Lab. | Specific Gravity | Brinell | | P | 2.49 | 43 | | A | 2.90 | 80 | Signed [Illegible signature] This Sheet must be filed on completion of the work. | ||