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 for an experimental 20-HP exhaust manifold.
| Identifier | ExFiles\Box 19\7\ Scan088 | |
| Date | 1st May 1926 | |
| LEAD IN AT ABOUT 30°, 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, ARH, 1/5/26 | ||