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 modifications to an existing casting for a larger valve chamber.
| Identifier | ExFiles\Box 105\3\ scan0329 | |
| Date | 3rd April 1933 | |
| Hs{Lord Ernest Hives - Chair} 974 3-4-33 TAPER 28° ± 1/4° EXISTING CASTINGS F100694 WILL MAKE 4.375 DIA +1/2 .650 DIA 2.50 +5 5.25 +2 VALVE CHAMBER - N SCN 3497 LARGER VALVE. 4 OFF 1/C FOR OTHER DIMENSIONS SEE F100694 ROLLS-ROYCE, LTD PRINT ROOM 4 APR 1933 DERBY. | ||