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).
Complaint letter to The British Thermostat Co. Ltd. regarding thermostat units not meeting the specified temperature limits.
| Identifier | ExFiles\Box 156\2\ scan0121 | |
| Date | 7th September 1938 | |
| c. B c. RHC.{R. H. Coverley - Production Engineer} Rm{William Robotham - Chief Engineer}/Std.1/MH.{M. Huckerby} Experimental Dept. 7th. September 1938. The British Thermostat Co. Ltd., Teddington Works, Windmill Road, Sunbury-on-Thames, MIDDX. For the attention of Mr. Martin-Hurst. Dear Sirs, Referring to the writer's telephone conversation with Mr. Martin-Hurst, we have now rechecked the thermostat unit to EB.3509 which you have sent the writer, and which has been previously returned to you twice as being incorrect, and agree that it is now just within the drawing limits, i.e. it opens at 77°C. We have since found, however, two further units which are incorrect - one opens at 78°C and the other at 73°C - according to our production people here, both have been returned to you for correction already, yet they are still not right. As explained over the telephone to Mr. Martin-Hurst, the order for these thermostats was placed on the understanding that the drawing temperature limit of 75-77°C opening temperature would be rigidly adhered to, and in consequence of that have made no arrangements for checking these units here. The result is that owing to the inaccurate settings of the units supplied we are being put to considerable expense and inconvenience as any defective thermostat involves stripping the housing and assembly. While the excuse of scratch brushing having introduced an unforeseen work-hardening effect may be put forward for the initial errors, we do not see any reason why units should have to be returned twice for correction, particularly as we have purchased a number of thermostats for experimental use from another supplier without any discrepancy being apparent. | ||