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 cracks that developed on a Wraith Bakelite oil pump casing after use.
| Identifier | ExFiles\Box 149\2\ scan0202 | |
| Date | 12th April 1939 | |
| WRAITH - BAKELITE OIL PUMP CASING. C A B DELIVERY PORT. CRACKS SHOWING IN CASING AT END OF 652 HOURS. FIG II. 12.4.39 | ||