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).
Extract discussing different methods for dimming headlights, with reference to Buick and Marmon systems.
| Identifier | ExFiles\Box 32\5\ Scan111 | |
| Date | 6th November 1920 | |
| X1692 Extract from Oy5/G6.11.20. X.4291. Re Headlight Dimmers. X.1357. X.1692. X.3317. The usual method of dimming headlights it to insert a resistance in the headlight circuit, but the more efficient methods are - (a) To connect the headlights in series. (b) To illuminate small auxiliary bulbs in the crown of the headlight reflector. This latter method will be seen on the Buick whichnwe are sending over, while a similar scheme is on the Marmon. We should be glad to know whether you think that this condition can be taken care of on the new Rolls-Royce switch box. Oy. | ||