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).
Desirable type of electric headlamp and its specifications.
| Identifier | ExFiles\Box 61a\1\ scan0030 | |
| Date | 4th January 1915 | |
| Wor{Arthur Wormald - General Works Manager}/Hy{Tom Haldenby - Plant Engineer}7/L4115. X.1354. X.1354. RE HEADLAMPS. X.1369 X.1114 Na.{Mr Nadin} 4-1-15. In reply to Na{Mr Nadin}/S6/LG241214. With reference to the enquiry as to which is the most desirable kind of electric Head Lamp, I think the special type of lantern, a sample of which was recently supplied to us by the C.A.V. people, to possess more virtues than any other lantern I have tried. This type of Head Lamp has the large F type reflector fitted into a body which is only slightly larger than the small F.{Mr Friese} type lantern. The diameter of the front is 11¼" only and the front glass is 10" dia. The reflector is therefore very large compared with the outside diameter of the lantern, the bezel being only ⅝" wide. We have not run the lamps about on the road but are just fitting a pair to an experimental car. When fitted with No.13 spiral filament C.A.V. Ediswan bulbs the light is excellent for driving, and when fitted with half watt 4 amp.bulbs the light is exceedingly powerful and makes fast night driving safe and easy. This intense light must be very | ||