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).
Inquiry to the Foster Instrument Co. Ltd. for a 'Resilia' Patent Dial Recorder to measure temperature on aero engines.
| Identifier | ExFiles\Box 165\3\ img147 | |
| Date | 25th August 1936 | |
| r6033 Hs{Lord Ernest Hives - Chair}/Wst.12/JH. 25th August, 1936. The Foster Instrument Co.Ltd., Letchworth, Herts. Dear Sirs, We are writing to inquire if you can supply us with one of your recorders, say the "Resilia" Patent Dial Recorder with 24 hour chart. Clock driven mechanism, and dotting method operating 10 times per minute. To have a scale 0-350°C. and calibrated to suit copper-constantan thermo couples with constants as follows :- Temp. °C. Millivolts. 0 0 100 4.25 200 9.21 300 14.66 350 17.50 Provided for an external resistance of 30.0 ohms. We require this recorder for measuring temperature on aero engines, both on the test bed and in flight and consequently must withstand a certain amount of vibration and its reading not be be affected by the angle at which the instrument may be placed, for instance when the plane is banking. | ||