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 cross-section of a piston with detailed dimensions and manufacturing notes.
| Identifier | ExFiles\Box 173\3\ img032 | |
| Date | 2nd June 1934 guessed | |
| Handwritten notes: Necessary for piston particularly clean up Printed notes: BREAK CORNERS OF ALL RING GROOVES NOT TO EXCEED .010R TO BE SQUARE WITH O.D. OF SKIRT WITHIN CORE DIA. Handwritten notes (right side): 7040/7461 Run a core pin suitably for this dimension Handwritten reference: V-31 Dimensions: 2 1/2 DIA. 1 1/8 B 3/32 5/64 .370/.372 3 1/2 DIA. .328/.318 1/8 1/4 11/64 15/64 1.995/2.000 3 3/8 2.870 C / 2.880 2.910 / 2.920 .335/.345 .8535/.8555 5/32 7/32 1/16 .028/.038 | ||