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).
Design sketch for a Goshawk II gearbox spigot bearing with notes on alternative materials.
| Identifier | WestWitteringFiles\G\October1921\ Scan67 | |
| Date | 18th February 1931 | |
| P.B. BUSHES STEEL INTERMEDIATE BUSH. Goshawk II Gear Box Spigot Bng. Also Try Alternative Type With 2 Bushes 1. External C.I. & 1 Internal P.B. R R 8382 (T 04) H.2. D80. (18-2-31). C 3002 | ||