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).
The Mentor full charge or excessive voltage indicator.
| Identifier | WestWitteringFiles\M\2April1925-June1925\ Scan3 | |
| Date | 8th April 1925 | |
| R.R. 493A (50m) (D.B. 173 25-9-24) J.H.D. EXPERIMENTAL REPORT. Expl. No. 4122 REF: EFC1/T8.4.25. To R.{Sir Henry Royce} (at Le CanadelHenry Royce's French residence). c. E.{Mr Elliott - Chief Engineer} De. c. Rg.{Mr Rowledge} By.{R.W. Bailey - Chief Engineer} c. CJ.& PN.{Mr Northey} c. EP.{G. Eric Platford - Chief Quality Engineer} MENTOR FULL CHARGE OR EXCESSIVE VOLTAGE INDICATOR. We recently received for test a small instrument as above, a detailed description of which is contained in my assistant's report AC.44 herewith. In any electro-magnetically operated relay, the voltage cannot be the only quantity upon which its operation depends, as there is the change of resistance with temperature difficulty and the difficulty of correct control of the contact lever. The operation of the present instrument, however, depends almost entirely on voltage alone, being practically unaffected by changed in ambient temperature. In this respect, therefore, it is a big step towards what might be considered by some to be required on a chassis electrical system. We have set the instrument to operate and light the lamp when the voltage reaches 15.9, and we are having it placed on an experimental 20 HP. chassis for observation. EFC. AC.44 attached. | ||