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).
Experiment card to determine the standard for piston rings, comparing plain versus double-ring types.
| Identifier | ExFiles\Box 16\1\ Scan119 | |
| Date | 13th June 1910 | |
| X741 EXPERIMENT CARD To... N. Barrington Date issued...13/6/10 Job - Settle standard re piston rings - i.e. plain or "double-ring" Remarks - 1200 + 1201 now double Initials RB{R. Bowen} | ||