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).
Test report on car horns, detailing electrical measurements and pitch.
| Identifier | ExFiles\Box 166\9\ img193 | |
| Date | 23th February 1939 | |
| -2- Rm{William Robotham - Chief Engineer}/RC.{R. Childs}10/JH.23.2.39. (2). Both connected together through relay. Current taken. Volts on horn terminals Both horns loud. 9.2 amperes. 11.35 volts. Both horns soft. 3.8 " 9.0 " (3) Horns connected as in (1) but held rigidly in vice. Note of treble horn F.{Mr Friese} Note of alto horn D- Our standard horns are in the region of G and F respectively, from which it will be seen that the new type are lower pitched. We are now arranging for these horns to be fitted on a car. Rm{William Robotham - Chief Engineer}/RC.{R. Childs} | ||