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).
Blueprint detailing a modification to add air vent grooves to a piston.
| Identifier | ExFiles\Box 105\3\ scan0289 | |
| Date | 26th October 1938 | |
| 26-10-38 GROOVE .032" x .052" AT TOP OF PISTON REMOVE ALL SHARP EDGES. AIR VENT GROOVES IN PISTON - N.SCH 3517. MODIFICATION TO F59291/2/3. ROLLS-ROYCE START FROM OCT 26 1938 DERBY. HS{Lord Ernest Hives - Chair} 741 JR{Mr James Royce} | ||