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 performance and design flaws of the new type Lucas Headlamps for the Phantom III, including a proposed modification.
| Identifier | ExFiles\Box 167\1\ img175 | |
| Date | 20th August 1937 | |
| CHATEAUROUX. 6116. Rm{William Robotham - Chief Engineer}/IMW{Ivan M. Waller - Head of Chateauroux}/3/JAB.20.8.37. To. Rm.{William Robotham - Chief Engineer} c. By/RD. c. Rm{William Robotham - Chief Engineer}/RC.{R. Childs} c. Rm{William Robotham - Chief Engineer}/GWH.{George W. Hancock - Head Chateauroux} 32-EX. PHANTOM III. New Type Lucas Headlamps. Replying to By/RD.4/B.17.8.37, we agree that the driving light given by these lamps is excellent for long distance and straight roads, but that we should prefer more light on the sides of the road. We saw a scheme at Lucas for fulfilling this requirement, consisting of a piece of ribbed glass which was placed behind the front glass of the lamp for about 1/4 of the way up as shown in the sketch. The ornamental point at the top of the glass is bad, as it is very difficult to clean the glass round it, so that there is always a dirty corner which shows up badly. The cases are not sufficiently dust and moisture proof, and the reflectors lose efficiency accordingly. We have not yet had the opportunity of fully testing the dippers with the 20 ozs. spring. Rm{William Robotham - Chief Engineer}/IMW.{Ivan M. Waller - Head of Chateauroux} [Text from sketch] DIRT COLLECTS HERE RIBBED GLASS TO SPREAD LOWER BEAMS. | ||