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).
Procedure to prevent liquid blockage in gauges and a note on a support for an armoured casing.
| Identifier | ExFiles\Box 44\4\ Scan148 | |
| Date | 4th December 1929 | |
| Messrs. Rolls-Royce,Ltd., Date 4.12.29. Page 3 After this test, although the liquid may now be run out of the front glass into the back tube, there are bound to be small quantities of the liquid left on the sides of the glass, which might find their way into the top capillary when the gauge is dismantled from the dummy facia board at the coach-builders, and handled generally before final installation. The procedure which we adopt here, to prevent the liquid getting into the top capillary, is to test the gauge on our test-stand for shimming and accuracy, empty all the liquid out, and blow the gauge through with high pressure air from the pressure balance end, thus cleaning as far as possible, the small quantity of liquid on the walls of the glass tube. We next fill the gauge to zero, and then run the liquid back into the back tube. Thus the amount of liquid left on the walls of the glass tube, capable of running up and blocking the top capillary, is reduced to a minimum. We have recently had several instances of gauges returned to us which have been blocked at the top capillary, and we feel almost confident that the liquid has got into this tube, either during transit or testing. Support for armoured casing carrying pipe lines. This has been fixed to the side of the body, in the place occupied by the old pressure balance connection. | ||