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).
Performance comparison graph of various carburettor arrangements on a PII engine with an aluminium head.
| Identifier | ExFiles\Box 181\M9\ img028 | |
| Date | 10th July 1931 guessed | |
| SHEET II, Hs{Lord Ernest Hives - Chair} 411, COMPARISON OF VARIOUS CARB., ARRANGEMENTS P II 4.9 C/R ALUM HEAD, ① TWO S.U'S PIPE ABOVE, ② AS ① BUT PIPES JOINED TOGETHER CENTRALLY WITH THROUGH BORE, ③ TWIN RR CARB 1.4 DIA. CHOKES, ④ SINGLE CLAUDEL EAGLE IX. CHOKE 1.8" DIA., ALL TESTS OPEN EXHAUST, B.H.P., ENGINE R.P.M., B.M.E.P., INDUCTION DEPN, INS Hg, 110° SHAFT E32381, RM{William Robotham - Chief Engineer} 7731, EX, IN, 17, 13.4, 65, 59 | ||