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 from The British Thermostat Co. Ltd. to Rolls-Royce discussing thermostat manufacturing and design feedback.
| Identifier | ExFiles\Box 156\1\ scan0103 | |
| Date | 21th May 1935 guessed | |
| - 6 - Messrs. Rolls-Royce Limited. difference between the open and full open temperature to, say, 11°, your problem is simplified, particularly if the valve lift required is less than that shown on Drawing No. BGA. 1982. In conclusion, although we have criticised your schemes, perhaps a trifle strongly, we sincerely hope that you will not think that we are raising unnecessary diffi-culties. We know that if cost is no object there are very few things which are impossible, but the present case does not seem to be one where such expense and special precautions are justified. We take it that you wish to purchase any parts of your thermostat which you may have made out as reasonably as possible, and it is with this ultimate object in mind that our criticisms are offered. While as a Company we do our fair share of ex-perimental work, it is our policy to arrange for our in-struments ultimately to present a simple manufacturing problem, with all possible snags removed. We should not like to undertake the manufacture on a production basis of any instrument where after taking reasonable precautions, we could not be certain of a regular uninterrupted output, and we feel that such would not be the case were we to attempt to manufacture charged bellows units provided with no adjustment as shown on your drawings, EB. 667 and E.86612. We shall be very pleased to hear from you when you have had the opportunity of considering our remarks. If you care to send one of your engineers to these Works we shall be very pleased to give him our full atten-tion, and to show him the methods of manufacture which we have adopted, and which have, we think we may say without boasting, brought us such considerable success. Yours truly, THE BRITISH THERMOSTAT CO. LTD. W. Martin-Hurst. | ||