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).
Test report on the performance of a spring-operated pump at varying speeds.
| Identifier | ExFiles\Box 27a\2\ Scan070 | |
| Date | 14th June 1932 guessed | |
| -2- 1 min 55 secs. at 50 p.r.p.m. Up to 500 p.r.p.m. the plunger followed the cam correctly but the stroke decreased as the speed increased. This is characteristic of the behaviour of our own pump. The delivery curve, spring operated, obviously suffers from absence of Air bottles. W. Bell. | ||