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).
Laboratory report on the calibration of an R.P. Adjustable thermostat, noting an inability to test under a water head and observations of a lag in operation.
| Identifier | ExFiles\Box 156\1\ scan0004 | |
| Date | 7th May 1929 | |
| Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} +4508 H11/EA9.5.29. Laboratory. R.P. Adjustable Report No.L1503. Re Thermostat submitted for Calibration 7.5.29. We were unable to test the operation of the thermostat under a 5 foot head of water, owing to the water leak when the valve was closed. We have, however calibrated it under ordinary conditions. We send you herewith a sketch showing the temperatures at which the valve opens with different settings of the regulator. You will note that the valve is open at ordinary atmospheric temperature for the first eight notches of the regulator' travel, while with the regulator in any of the last four notches, the valve did not open, even at 100°C. We observed that when open, and particularly in the lower part of the temperature range, the valve could be set any- where with the finger. This of course, was corrected when the thermostat cooled, but there appeared to be a considerable lag, due to the cloth on the valve dragging on the contact surfaces. This is most apparent though on the temperature rising, between the temperatures 81 and 96°C. Under working conditions the lag may not be serious. Hl. HE Thermostat returned herewith. | ||