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).
Comparison of cylinder wear rates for different units after testing in France.
| Identifier | ExFiles\Box 103\4\ scan0199 | |
| Date | 31th May 1937 | |
| -2- Wear per 1000 miles. FRANCE. 3.B.IV. (B.3. Unit) 16,900 miles in France. Midland Cylinder Co. Wear ................... .0000885 Brinell = 205-214. 6.B.IV. (B.22 Unit) R.R. Cast Cylinders. Wear ................... .0000568 31.5.37. | ||