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 showing a modification to the oil drain slots in the governor housing of an S.S. Engine.
| Identifier | WestWitteringFiles\S\June1928-August1928\ Scan146 | |
| Date | 30th August 1928 | |
| THESE SLOTS INCREASED FROM 6 SLOTS .125 WIDE TO 12 SLOTS .250 WIDE BY .075 DEEP OIL DRAIN SLOTS IN GOVERNOR HOUSING OF S.S. ENGINE aehc 30/8/28 | ||