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 three different designs for 20 HP exhaust manifolds.
| Identifier | ExFiles\Box 6\7\ 07-page032 | |
| Date | 15th December 1923 | |
| 20 H.P. EXHAUST MANIFOLDS. SCH 934. THIS MANIFOLD GIVES THE BEST POWER OUTPUT. SEE POWER CURVES SCH 936 SCH 935. THE APPENDED CURVES SHOW THE POWER OUTPUT WITH THE MANIFOLDS SHEWN ABOVE A.C.L. 15/12/23 | ||