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).
Advertisement for 'The New Sparton SOS' car horn.
| Identifier | ExFiles\Box 49\5\ Scan123 | |
| Date | 27th November 1925 guessed | |
| The successful outcome of 25 years' effort to produce the perfect horn. Note simplicity of mechanism—double diaphragm operated by the simplest of make-and-break circuits. The New SPARTON SOS THIS Horn has a remarkable tone projection of lightning speed—yet smooth, and with a ringing harmony of perfectly blended sound. A high frequency pitch that cuts through traffic rumble. . . No oiling, no cleaning, no adjusting. Nothing to get out of order. Made in two sizes: SPARTON S.O.S. - £5 12 6 SPARTON S.O.S. JUNIOR £3 17 6 ALFRED GRAHAM & CO. (E. {Mr Elliott - Chief Engineer} A. {Mr Adams} GRAHAM), St. {Capt. P. R. Strong} Andrew's Works, Crofton Park, LONDON, S.E.4. Showrooms: 25-26, Savile Row, W.1. 79-82, High Street, Clapham, S.W.4. 101, St. {Capt. P. R. Strong} Vincent Street, Glasgow. 10, Whitworth Street West, Manchester. | ||