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).
Comparison drawing showing an existing scheme and a suggested modification for a mechanical component, possibly a seal or bearing assembly.
| Identifier | ExFiles\Box 152\2\ scan0242 | |
| Date | 3rd February 1939 guessed | |
| EXISTING SCHEME PD 320A. SUGGESTED MODIFICATION BAKELITE OR TUFNOL RING MILLED SLOT IN CASE FOR DRAIN | ||