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).
List of requested alterations for various parts, with a supporting diagram for one modification.
| Identifier | ExFiles\Box 13\3\ 03-page155 | |
| Date | 16th December 1929 guessed | |
| Please supply drawings showing the following alterations :- (1) E.79642 - Length of slots increased to 2.900".no (2) E.79643 - Size of the 40 holes to be increased to .505.no dia. (3) E.79644 - Length of slots increased to 1.050".no (4) E.79645 - The 28 holes to be elongated (towards the middle of tube) so as to form slots .650".no long. (5) E.79576 - Increase screw - thread size from 1.750"dia x 16 TPI, to 1.995" dia x 16 TPI, also 1.625"dia hole to 1.900.dia, to take standard suction chamber (E73036). (6) E.73036 - Modify by turning an undercut as follows:- Text from diagram: 1.150 .375 .050 RAD UNDERCUT 1.725 -.5 DIA | ||