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).
Drilling diagram for a main cylinder and end cover, common to the 20/25 HP and Phantom II models.
| Identifier | ExFiles\Box 105\3\ scan0209 | |
| Date | 12th November 1931 | |
| FS{F. Steele}3922, DOTTED LINES INDICATE PRESENT, DAMPER CASING OUTLINE, DRILL .337 DIA TAP .375 DIA, 26 TPI RH{R. Hollingworth}, E 77242, F 83919, F 83920, F 77983, E 8153, SCALE 2/1, DRILLING FOR MAIN CYLINDER & END COVER, COMMON TO 20/25 HP & PII, .625, .4375, PULLS TO BE RETURNED TO RECORDS IMMEDIATELY, ROLLS-ROYCE, LIMITED, PRINT ROOM., 12 NOV 31, DERBY. | ||