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. concerning a faulty thermostat where the valve head became loose due to a melted soldered joint.
| Identifier | ExFiles\Box 156\1\ scan0278 | |
| Date | 7th October 1937 | |
| Telephone: SUNBURY-ON-THAMES 456 (6 LINES) Telegrams & Cables: THERMOSTAT, SUNBURY-ON-THAMES. Code: BENTLEY'S THE BRITISH THERMOSTAT CO., LTD. Makers of Scientific Instruments. DIRECTORS: COL. N. HUDSON, J.E. SHERLOCK } MANAGING. W.P.F. MARTIN-HURST, L.S. SWINNERTON DYER. F.G. POPLETT. TEDDINGTON WORKS. Windmill Road, Sunbury-on-Thames, Middlesex. WMH/GN: Your Ref: Rm{William Robotham - Chief Engineer}/Std.14/MH{M. Huckerby}: October 7th, 1937. Messrs. Rolls-Royce Limited. DERBY. Dear Sirs, For the attention of Mr. Steadman. We thank you for your letter of October 5th. We have examined the thermostat which you have returned to us, and find that the valve head became loose for the following reason. The head was undoubtedly properly soldered in place as particular care was taken in the construction of these thermostats and the writer personally examined them. It appears, however, that in making the soldered joint between the ball valve cap and the valve head, the inner soldered joint, which is responsible for sealing the charging peg and for locking the head to the spindle, was melted. It is probable that after the outer soldered joint was made, the thermostat was turned over on its side before the inner joint had time to re-set, since we found a pile of solder at one side of the ball valve pressing. It is not our normal practice to solder the ball cap pressing to the valve head, which explains why we have not come across this trouble before. [Handwritten Notes] Top center: 1328 Right margin: [illegible signature] Rm{William Robotham - Chief Engineer}/519 | ||