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).
Fitting instructions for a Stelmar Fog and Anti-Dazzle Lamp from Banting & Tresilian, Ltd.
| Identifier | ExFiles\Box 61a\2\ scan0470 | |
| Date | 10th January 1935 | |
| TELEPHONE: VICTORIA 4173-4174 DIRECTORS: P. E.{Mr Elliott - Chief Engineer} BANTING A.{Mr Adams} S. TRESILIAN In Reply Please Quote Our Ref. Hs{Lord Ernest Hives - Chair}/Wst.12/MA. Your Ref. Sole Licensees for STELMAR PATENT COMBINED ANTI-GLARE HEADLAMP AND FOGLAMP for all classes of Motor Vehicles BANTING & TRESILIAN, LTD. ENGINEERS 64 VICTORIA STREET LONDON, S.W.1 TELEGRAMS: MORSENDUS, SOWEST, LONDON. 10th January, 1935. Messrs. Rolls Royce Ltd., DERBY. Dear Sirs, For the attention of Mr. West. Stelmar Fog and Anti-Dazzle Lamp. With reference to Mr. Tresilian's interview with Mr. West at Derby yesterday, when the Stelmar Fog-Lamp was demonstrated in your laboratory, we understand that you will be fitting this lamp on a car at the earliest possible moment so that it can be tried out by you in fog. We beg to emphasize the following points which Mr. Tresilian explained to Mr. West were so essential for the efficient performance of the lamp in fog:- (1). The height of the centre of the lens from the ground level when mounted and in position should not be more than 25". (2). When the lamp is erected it should be dipped slightly as clearly indicated on the sketch left with Mr. West, the height of the cut-off line being measured at about 5 yards in front of the lamp and then again at 25 yards when the position of the cut-off line should be lower than at 5 yards. The amount of this dip will depend on the particular driver, as some drivers like the light dipped more than others. This is found out by experiment in a few minutes when driving. (3). When the lamp is erected, it will be necessary to see that the buffers, if any are fitted to the car, do not interfere with the bottom periscope lighting to the kerb as this light must be left entirely unobstructed so as to give the best results. | ||