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 diagram illustrating cracks found within the casing of a Wraith Bakelite oil pump.
| Identifier | ExFiles\Box 149\2\ scan0192 | |
| Date | 21th March 1939 | |
| WRAITH BAKELITE OIL PUMP CRACKS IN CASING SPINDLE SUCTION PORT. BUSH DELIVERY PORT THE CRACKS SHOWN ONLY APPEARED ON THE INSIDE OF THE CASING VhL [initials] BL 2318 21-3-39 | ||