Blueprint of an experimental 20 horsepower exhaust manifold.
| Identifier | ExFiles\Box 6\7\ 07-page014 | |
| Date | 16th October 1926 | |
| LEAD IN AT ABOUT 30° 1.500 DIA BRANCH PIPES INCR TO 1.500 DIA WHERE THEY MERGE INTO DOWN PIPE INTERNAL DIA 2.000 TO SILENCER EXPL. 20-HP EXHAUST MANIFOLD AHT 16/10/26 | ||
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).