Blueprint detailing drilling specifications for a main cylinder and end cover.
| Identifier | ExFiles\Box 56\1\ Scan189 | |
| 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} .4375 .625 +5 E 77242 F 83919 F 83920 F 77983 E 8153 SCALE 2/1 DRILLING FOR MAIN CYLINDER & END COVER COMMON TO 20/25 HP & P-III 12 NOV 31 | ||
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).