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).
Technical memo discussing the design and performance of a pump, its efficiency, and mounting options.
| Identifier | ExFiles\Box 44\3\ Scan153 | |
| Date | 14th January 1929 | |
| Messrs. Rolls-Royce Ltd., Date 14.1.29. Page 3 without any valve in it, and not draw petrol up into the line. The volumetric efficiency of the pump may not be quite complete, but sufficient air is pumped, even with a very small pump, to give a large surplus delivery. We believe that this will make a reliable fitting, not dependent on a valve of any sort, and the cup leather in the pump appears to be sufficiently flexible to give sufficient air. The time yaken to fully correct the unit with the pump is approximately the same, even if the capacity is doubled. We are sending two styles of pump; one for fixing from the front, and the other from the back of the facia board, and we shall be obliged if you will let us have your remarks. It appears to take about sixty seconds continuous pumping to replace all the air in the average unit. As the pump will only be used for topping up a small portion of the bell in the usual way, this would appear to be satisfactory. If more rapid correction of the gauge were required, we believe the bell plate would have to be eliminated, or nearly so, and possibly it would be necessary | ||