Photographic comparison of four different carburetor models with identifying labels.
| Identifier | ExFiles\Box 122\3\ scan0096 | |
| Date | 10th October 1938 guessed | |
| Label 1: TYPE DIA 30 No. 2903 PRICE 28 6. (1) Label 2: TYPE DA {Bernard Day - Chassis Design} 36 No. 8813 PRICE 33 3. (2) Label 3: TYPE DBY 30 No: A 4810 PRICE. 35- (3) | ||
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).