Blueprint detailing the arrangement of two Zenith carburetters on the 20HP model.
| Identifier | ExFiles\Box 22\4\ Scan125 | |
| Date | 1st April 1927 guessed | |
| 6 SHORT EXH PIPES. HORIZONTAL ZENITH TRIPLE DIFFUSER CARB ARRANGEMENT OF THE TWO ZENITH CARBURETTERS ON THE 20.H.P. EXH PORTS INLET MANIFOLDS FLANGES FOR THE TWO ZENITH CARBS. | ||
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).