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).
Request to conduct comparative tests on the lighting intensity of various headlamps.
| Identifier | ExFiles\Box 61a\1\ scan0010 | |
| Date | 28th July 1914 | |
| R.R. 637. (100H) (WW. 508. 1.7.14.) E.P. 6884. ROLLS-ROYCE LIMITED, NIGHTINGALE ROAD, DERBY. TELEGRAMS: "ROYCAR," DERBY. TELEPHONES: 476 (Four Lines). Names and Indicating letter. Initial of person addressed. A Mr. ADAMS By Mr. BAILEY Bn{W.O. Bentley / Mr Barrington} Mr. BARRINGTON B Mr. BEREND Bt{Capt. J. S. Burt - Engineer} Mr. BURT Cn{Mr Chamberain} Mr. CHAMBERLAIN (O.O. for Exptl. Dept.) Cr{Mr Cra???ster / Mr Chichester} Mr. CHICHESTER C Mr. COWEN Cx{Major Len W. Cox - Advertising Manager} Mr. COX D Mr. DeLOOZE Da{Bernard Day - Chassis Design} Mr. DAY E Mr. ELLIOTT Eu EUROPE Hy{Tom Haldenby - Plant Engineer} Mr. HALDENBY Hm{Capt. W. Hallam - Head Repairs} Mr. HALLAM H Mr. HANBURY J Mr. JOHNSON JS{Mr Johnson's Secretary} Mr. JOHNSON'S Secretary BJ Mr. BASIL JOHNSON K Mr. KILNER Mac{Mr Macintosh} Mr. MACKINTOSH Mer Mr. MERCER M Mr. MOON Na{Mr Nadin} Mr. NADIN PN{Mr Northey} Mr. NORTHEY O Mr. OLDHAM Pa{Mr Paterson} Mr. PATERSON PF Mr. PLATFORD R Mr. ROBINSON Re Mr. ROYCE Rs{Sir Henry Royce's Secretary} Mr. ROYCE'S Secretary JR{Mr James Royce} Mr. JAMES ROYCE S Mr. SANDERSON LHS{Lord Herbert Scott} LORD HERBERT SCOTT Sp{Mr Spinney} Mr. SPINNEY V VIENNA Wa{Mr Wallis} Mr. WALLIS Whe Mr. WHEELER Wd{Mr Wood/Mr Whitehead} Mr. WHITEHEAD Wor{Arthur Wormald - General Works Manager} Mr. WORMALD RE HEADLAMPS. We wish to make some comparison of head-lamp-powers, and should be glad if you would arrange to carry out some tests with a view to comparing the lighting intensity at say, 30, 50 and 100 yards, and further if possible, of C.A.V., Lucas, and Bosch headlamps with several variations in the c.p. of the bulbs and in the type of bulb, i.e., as to size and concentration of the filament. These tests could, of course, be carried out with a spot of spermaceti dissolved in naphtha, on a white paper screen, the lamps to be compared being placed on either side of the screen and their distances from it adjusted until the grease spot disappears. The intensity of lighting is then proportional to the square of the distances of the lamps from the screen. Da.{Bernard Day - Chassis Design} This sheet must be filed with the correspondence to which it refers. | ||