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).
Information on the sound travel distance of an Alfred Graham & Co. Electrical Autohorn.
| Identifier | ExFiles\Box 49\5\ Scan096 | |
| Date | 23th February 1921 | |
| R.R. 235a (100 T) (S.H. 798. 10-12-20) G. {Mr Griffiths - Chief Accountant / Mr Gnapp} 2948 X.4278 To Wd. {Mr Wood / Mr Whitehead} from Hs. {Lord Ernest Hives - Chair} Hs {Lord Ernest Hives - Chair} 3/LG23.2.21. X.4278 - Alfred Graham & Co. Electrical Autohorn. With reference to your Wd {Mr Wood / Mr Whitehead} 3/NJ21.2.21 and to the attached correspondence from the above Company dated 18th. Feb.21. Before we ask these people to submit to us a sample Horn, could you please obtain from them the distance the sound of their Horn will travel. So far, we have not found anything but a motor-driven horn which will carry the sound a sufficient distance. Hs. {Lord Ernest Hives - Chair} Leaflet returned to Wd. {Mr Wood / Mr Whitehead} | ||