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).
Letter from Joseph Lucas Ltd. discussing dipped beam headlamp designs, including an auxiliary bulb system and a mechanically operated reflector.
| Identifier | ExFiles\Box 61a\1\ scan0394 | |
| Date | 30th October 1928 | |
| P/126 JOSEPH LUCAS LTD., PAGE 3 DATE 30th October, 1928. To Messrs. Rolls Royce Ltd., D E R B Y. which we have introduced to meet the request for a dipped beam. This lamp incorporates an auxiliary bulb behind a small lens in the top half of the reflector which, when in operation, throws a flat dipped beam which is most effective when driving through towns and meeting oncoming traffic. By moving the auxiliary bulb up and down in its holder, it is possible to settle on an angle of dip between wide limits to suit individual requirements. Once decided upon however, the angle of dip cannot be altered without re-adjusting the auxiliary bulb. The change over from the main bulb to the auxiliary is effected by a small switch placed on the steering column, or the dashboard whichever is the more convenient. We have had some encouraging comments passed on this lamp by various users, but it is yet in the experimental stage, in so far that we have not finally decided to go ahead with production. If you will refer to the correspondence between your West WitteringHenry Royce's home town house and Mr. Oliver Lucas, you will see that we are also considering a mechanically operated dipping reflector for the P.100 headlamp, and it is for this reason that we are not yet pushing the double bulb type. We trust these remarks have been clear to you, but if this should not be the case, or if we can give you the benefit of our experience on any similar problem, we shall be only too glad if you will advise us of the fact. Yours faithfully, JOSEPH LUCAS LIMITED., [Signature] K.L. Neice Managing Director's Office. | ||