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).
Potential design issues with the Cambridge Thermometer, including proximity of parts to live connections and dial overrun.
| Identifier | ExFiles\Box 175\4\ img088 | |
| Date | 10th October 1927 | |
| Roy.{Sir Henry Royce} from By.{R.W. Bailey - Chief Engineer} c.to EFC. X3875 By1/J4.10.27. Cambridge Thermometer. Referring to Roy{Sir Henry Royce}11/MG3.10.27 and the Cambridge Instrument Co's letter of 1st inst., our impression agrees with the views put forward by the Cambridge Co. namely, that a few of the early thermometers ran rather close in some of their working parts to the live connection of the instrument, but that not all of them by any means were likely to give trouble. These views were confirmed by Mx.{John H Maddocks - Chief Proving Officer} We have since instituted a test to check that no short circuit throughout the range of the instrument occurs and we think that the matter can now be considered satisfactorily settled. There was one other point that EFC. mentioned, namely, that it might just be possible for the finger on the dial to over-run the 100° slightly and touch the stop. A piece of insulation like a cylinder with an end in it and a hole drilled through so that the head of the screw was carried inside the cylinder of insulating material would overcome this. It might be worth while asking them to consider this point as well. [Circular Stamp: RECEIVED, 14 OCT 1927] BY.{R.W. Bailey - Chief Engineer} By | ||