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).
Instructions for testing a liquid gauge instrument on a car under acceleration.
| Identifier | ExFiles\Box 44\2\ Scan210 | |
| Date | 31th August 1928 | |
| Messrs.Rolls-Royce, Ltd., Date 31. 8. 28. Page 2 you would test this point for us at the very first opportunity on fitting to a car. Before coupling up the instrument, set the liquid exactly to zero, couple up in the ordinary way both front and back, fill the tank until it is completely full, the level slightly into the filler if possible. Test the car on first, second and other gears for acceleration, and see whether the inertia forces on the gauge itself are sufficient to force the liquid over into the pressure balance line, under conditions of extreme acceleration on your lower gears. To deal with this point, we have had to increase the length of the capillary tube between the front and back legs of the U tube, which has a considerable damping effect on the rate of interchange of liquid from the back tube to the glass tube. The rise should not be much in excess of one to two gallons reading on the scale, and we think that there is sufficient room at the top of your scale to deal with these conditions, but we should be obliged if you would test it with a full tank as specified. Assuring you at all times of our best attention, We remain, dear Sirs, Yours faithfully, H.M.HOBSON,Ltd., T.P.Searight Joint Managing Director. | ||