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).
Letter discussing modifications to a unit with tubes, cups, and a bell to suit specific conditions.
| Identifier | ExFiles\Box 44\2\ Scan159 | |
| Date | 29th June 1928 | |
| Messrs. Rolls-Royce, Ltd. Date 29. 6. 28 Page 2. definitely without a trial. We would suggest, however, that you give us a small sketch of your problem, when we will make you up a unit with the tubes which carry the cups and bell, tilted or cranked to suit your conditions. On these tubes we would install horizontal pumping cups, and we would set the bottom of these tubes so as to maintain the bell in an upright position. In this way the action of the unit would be absolutely normal. We should retain our datum line, from which we start our calibrations, at the same position in the bell as at present. We should explain that this datum line is not at the extreme bottom of the bell, nor is it at the top of the bell plate where the hole communicates with the bell itself. It has been found to be approximately mid-way between these two points, because under running conditions there is a large bubble of air continually beneath this bell plate. By tilting the bell to any considerable angle, the datum may be altered - how much, we do not know. We believe we could successfully accommodate your requirements by setting the two main tubes in two directions as indicated, installing horizontal Sprengel cups and leading the air pump tubes to accommodate the | ||