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).
Agreed-upon scheme for a headlamp dimming device using a single resistance.
| Identifier | ExFiles\Box 61a\1\ scan0091 | |
| Date | 13th January 1921 | |
| To Ds. from EFC. c. to Ds/EV.{Ivan Evernden - coachwork} c. to Hs{Lord Ernest Hives - Chair}/TWB. X.4291 EFC4/T13.1.21. X.4291 - DIMMING DEVICE FOR HEAD LAMPS. Further to our EFC2/T11.1.21 and our conversation yesterday on the matter, we nowagree that on the whole the simplest way of accomplishing this, in view of the fact that the lesser efficiency of the modification does not matter, is to provide a single resistance operating upon both head lamps in parallel and a short circuiting switch for this resistance. Perhaps you would, therefore, kindly go ahead and get out such a scheme. EFC. | ||