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 to The Packless Gland Co. Ltd. discussing test results and requirements for thermostats, bellows, and glands.
| Identifier | ExFiles\Box 151\2\ scan0139 | |
| Date | 11th January 1934 | |
| X4698 Exptl. Dept. Hs {Lord Ernest Hives - Chair} /Les.7/KW. 11th January, 1934. The Packless Gland Co. Ltd., Windmill Road, Sunbury, Middlesex. For the attention of Mr. Martin Hurst. Dear Sirs, Thermostats E.80893. We have carried out further tests with your thermostats, comparing them with the Smith Calorstats. For our requirements your instrument is the inferior. We enclose figures and graphs which confirm the results we have obtained on the road. Your Thermostat has a very small "Full" load in the closed position. Perhaps there is a greater vacuum in the closed position with the Smith instrument. We are not fully satisfied with the Smith instrument, and would like an even greater push above the opening temp. in the extended position, and a greater pull below the closing temperature when the shutters are closed. Bellows F.85875. We are very anxious to get some of these on test in the immediate future. We should be very grateful if you would urge 4 out of the 12 on order, and dispatch them immediately they are ready. We are arranging for the back plate to be a sheet metal pressing. Gland Hs. {Lord Ernest Hives - Chair} 1077. You will have now received the bushes and springs for 12 gland assemblies. It appears from the results of your test that the single wall bellows will be quite satisfactory. When you were last at Derby you said you were going to let us have a sample jet assembly for an S.U. carburetter. You were also going to let us have a gland for one of our water pumps. | ||