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).
Issues with sticking dippers in modified P.100 headlamps due to their oval reflectors.
| Identifier | ExFiles\Box 61a\3\ scan0092 | |
| Date | 2nd July 1935 | |
| 46116. WST Hs{Lord Ernest Hives - Chair}/Wst. c to Cx.{Major Len W. Cox - Advertising Manager} c to Br.{T. E. Bellringer - Repair Manager} PK/2.7.35. Modifications to P.100 Headlamps. Having made a critical examination of the modified type headlamp, we are doubtful whether the modifications when they are carried out, will overcome the trouble which they are intended to cure, that is, sticking dippers. We find that the reflectors are oval, the small diameter being horizontal across the hinge brackets and the large diameter vertical (top to bottom). The ring holding the glass in the bezel is only held by springs and it can be moved out of centre as much as an eighth of an inch. We think it can be assumed that road shocks and vibration will cause the ring to drop to its lowest position and if the reflector is oval to any great extent, it will then foul on the top portion of the ring. It seems to us that the dipping trouble can only be eliminated by ensuring that the reflectors are round and that the glass retaining ring is located centrally in the bezel. An alternative would be to increase the clearance between the reflector and the bezel ring. We have found that in all cases of sticking dippers experienced here, the dipper mechanism has been working perfectly when the front of the lamp has been opened, thereby removing the cause of fouling. I would be glad if you would consider the above remarks. The changing over of headlamps or their interiors is going to be a fairly big undertaking so that first of all it must be ascertained for certain that the trouble is going to be permanently cured. PK. | ||