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).
Drawing detailing modifications for air vent grooves in a piston.
| Identifier | ExFiles\Box 105\3\ scan0292 | |
| Date | 26th October 1938 | |
| 26-10-38 GROOVE .032 x .032 AT TOP OF PISTON +2 +2 REMOVE ALL SHARP EDGES. AIR VENT GROOVES IN PISTON - N.SCH.3517. MODIFICATION TO F59291/2/3. HS.{Lord Ernest Hives - Chair} 741 | ||