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 of a letter from The Walmsley Patent Lamp Co. Ltd. describing the functionality of a new lamp for testing.
| Identifier | ExFiles\Box 167\1\ img198 | |
| Date | 23th October 1937 | |
| EXTRACT OF LETTER FROM THE WALMSLEY PATENT LAMP CO. LTD. 180, Grays Inn Road, LONDON. W.C.1. 23rd October, 1937. 'The lamp we have dispatched to you for test, is fitted with a 36 watt bulb and the whole of the light source is utilised. The most intense glare originates at the diametric point opposite to the filament and continues around the sides of the reflector between the intervening space to the front lens. This dazzle is broken up by the cone into innumerable percolating rays through refraction upon refraction and actually enables the fog to be used as a medium for suffusing and diffusing the light. This factor is of vital importance as the whole contour of any oncoming vehicle is silhouetted to a distance of 25 feet and avoids the risk of collision. We enclose Press cuttings relating to the issue of a special report by the Department of Scientific and Industrial Research relative to the use of yellow light and also the dictum of the Windsor coroner at a public inquest, stating that motorists, when travelling with dipped headlights, should go dead slow.' | ||