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 showing detailed cross-sections and dimensions for a piston.
| Identifier | ExFiles\Box 173\3\ img019 | |
| Date | 2nd June 1940 guessed | |
| BREAK CORNERS OF ALL RING GROOVES NOT TO EXCEED .010R, TO BE SQUARE WITH, DIA., 2 1/2 DIA., 13/64, 3/16, 9/64, 3/64, 3/8, .328, .318, 1/8, 1/16, 1/64, 4025, 4000, 9/16, 3/8, 5/32, 1/32 R, 5/16, .370, .372, 3/64 R, 15°, 3 1/2 DIA., 3 7/8, 2.870 DIA., 2.880, 2.910 DIA, 2.920, CORE DIA., .932, .942, .8580, .8595, 4/29/32, 1/16 R, 1/64 R, 5/32, 1/32, 30°, 1/16, .073, 2.74 | ||