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).
Technical drawing for an A.T. Speedometer with a trip meter, showing various finish options.
| Identifier | ExFiles\Box 15\7\ Scan122 | |
| Date | 16th December 1929 | |
| DIAL SUITABLY SECURED TO INSTRUMENT NO GLASS REQUIRED THIS SPEEDOMETER TO BE SUPPLIED TO SUIT 11 x 41 AXLE RATIO (1185 R.P.MILE.) 33 x 5.750 TYRES. 'ARABIC' FIGURES ON DIAL TITLE: A.T. SPEEDOMETER (WITH TRIP) TABLE: PIECE N° | FINISH - | INDICATOR DIAL PLATE | FIGURES & POINTER F.79891 BLACK | CAMBRIDGE BLACK DIAL TYPE B1 | WHITE F.79892 BLACK LUMINOUS | BLACK | LUMINOUS F.79893 NICKEL | WILLIS DIAL (TYPE B1) FRENCH SILVERED ON BRASS | BLACK F.79894 NICKEL LUMINOUS | BLACK | LUMINOUS F.79895 SILVER | WILLIS DIAL (TYPE B1) FRENCH SILVERED ON BRASS | BLACK F.79896 SILVER LUMINOUS | BLACK | LUMINOUS F.79897 VENETIAN | WILLIS DIAL VENETIAN | BLACK | ||