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 design variations for a 20 HP exhaust manifold.
| Identifier | WestWitteringFiles\R\2December1927-February1928\ Scan209 | |
| Date | 15th December 1928 | |
| 20 H.P. EXHAUST MANIFOLDS. THIS MANIFOLD GIVES THE BEST POWER OUTPUT. SEE POWER CURVES SCH 934. SCH 936. SCH 935. THE APPENDED CURVES SHOW THE POWER OUTPUT WITH THE MANIFOLDS SHEWN ABOVE acks 15/12/28 | ||