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).
Use of a thermometer with an electric contact to illuminate a red warning lamp at 90°.
| Identifier | ExFiles\Box 175\4\ img037 | |
| Date | 24th June 1926 | |
| X43875 To EFC. from DA{Bernard Day - Chassis Design}/EV.{Ivan Evernden - coachwork} (Rm.{William Robotham - Chief Engineer}) DA{Bernard Day - Chassis Design}/EV{Ivan Evernden - coachwork}2/M24.6.26. RE. TEMPERATURE INDICATORS. X.3987 It seems apparent that we shall want to use the thermometer which makes electric contact, so causing a red lamp to glow when 90° is reached. As R.{Sir Henry Royce} wishes us to incorporate this in the patch of instruments which we are now designing, having interal illumination, we would be glad if you would tell us whether there is any increase in the size of the gauge, and what the lamp fixing is like. We suggest that you send us on loan one of these fixings. We would like to have it soon as we are now on the job. DA{Bernard Day - Chassis Design}/EV.{Ivan Evernden - coachwork} | ||