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).
Instructions regarding the operation and mounting of the Sparton horn.
| Identifier | ExFiles\Box 59\3\ Scan053 | |
| Date | 8th December 1924 | |
| RR 238 (150 BKS.) (DB{Donald Bastow - Suspensions} 461-8-12-24) MP 306975 ROLLS-ROYCE LTD. INSTRUCTIONS. To Order No. Customer's No. 19 in the case of the Sparton horn. On the more subdued note the horn will operate at 11.0 volts upwards the pitch frequency being 270 per sec as before, but the loudness considerably less. The mounting clips incorporates laminated steel strips similar to the Sparton. Signed J.A. This Sheet must be filed on completion of the work. | ||