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).
The failure of an Appollo horn on an experimental car and its replacement.
| Identifier | ExFiles\Box 49\5\ Scan107 | |
| Date | 6th April 1921 | |
| X 4278 Mr. Hives from GWH. {George W. Hancock - Head Chateauroux} 6.4.21. X 2474 X.4278 APPOLLO HORN. This Horn was fitted to 2.EX Car on the 18th.Jan.21. and failed on the 5th. April.21. having been run 1,883 miles. A Graham horn has replaced it. GWH. {George W. Hancock - Head Chateauroux} | ||