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 detailing the specifications for an oil jet for the No. 1 cylinder.
| Identifier | WestWitteringFiles\T\2July1929-December1929\ Scan050 | |
| Date | 31th January 1929 guessed | |
| OIL JET FOR No 1 CYLINDER DRILL .328 DIA TAP - .375 DIA 20 TPI 14° 55° 90° L.S / 7 O . 9 | ||