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).
Drawing of an automatic advance to suit a Simm's coupling with 20 teeth.
| Identifier | ExFiles\Box 43\4\ Scan098 | |
| Date | 22th December 1926 | |
| [ "203", "AUTOMATIC ADVANCE TO SUIT SIMM'S COUPLING (20 TEETH)", "589-1", "3.406"", "Thrd 3/8 WHIT.", ".591", "1/2"", ".25", "1.125"", "1.375"", "Alterations", "Init.", "Date", "For Model", "No off", "Signature", "North & Sons, Ltd", "WATFORD.", "Material", "22.12.26", "CWH" ], | ||