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).
Graph plotting the results of clearance volume tests on a petrol pump at various speeds.
| Identifier | ExFiles\Box 17\5\ Scan142 | |
| Date | 15th June 1932 | |
| LEC. 2961 PETROL PUMP CLEARANCE VOLUME TESTS. DELIVERY PTS/HR. PUMP SPEED R.P.M. STD. HEAD. CLEARANCE VOL. 9 cc's REDUCED HEAD. CLEARANCE VOL. 4 c.c's 160 140 120 100 80 60 40 20 500 1000 1500 2000 | ||