Graph comparing the delivery flow of a standard petrol pump against one with stronger springs under varying back pressure.
| Identifier | ExFiles\Box 20\9\ Scan135 | |
| Date | 1st April 1936 | |
| PHANTOM III PETROL PUMP TESTS (S.W.) SP. {Mr Spinney} 23 EFFECT OF BACK PRESSURE UPON THE DELIVERY FLOW PTS/HR. STANDARD PUMP AS DELIVERED BY S.W. SPRING WIRE .056 DIA: PUMP WITH STRONGER SPRINGS .068 DIA: 1lb ☐" BACK PRESS. INS. Hg. L.H.S / 4. 36. | ||
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).