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 showing suggested modifications to a change-speed valve for an Eagle XV 2-speed gear.
| Identifier | WestWitteringFiles\N\July1925-September1925\ Scan276 | |
| Date | 31th August 1925 guessed | |
| EAGLE XV 2 SPEED GEAR (a) OIL ESCAPE (b) OIL ESCAPE Additional Bearing Surface FIG IV SUGGESTED MODIFICATIONS TO CHANGE-SPEED VALVE A.A.R. | ||