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).
Diagram showing the cross-section of a fractured piston with area calculations.
| Identifier | ExFiles\Box 66\1\ scan0014 | |
| Date | 9th March 1925 guessed | |
| SECTION ACROSS WHICH PISTON FRACTURED E.A.C. AREA .920 ☐" B AREA .920 ☐ B AREA .72 ☐" TOTAL AREA 2.56 ☐" | ||