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).
Proposal for using the car's scuttle and dash as a horn amplifier, based on the principles of diaphragm speakers.
| Identifier | ExFiles\Box 137\4\ scan0285 | |
| Date | 25th March 1931 guessed | |
| (2) the pot of the dash has to diaparam. In this way we suggest that the column and dash between them form a very good amplifier working on the principle used in diaparam amplifiers for wireless telephony. In case of the speaker illustrated the amplification is 7 times the volume of sound of the iron microphone alone. In case of the car the scuttle will act as a horn amplifier also [Diagram Labels] AIR FIG 1 PLEATED PAPER METAL DIAPRAGM DIAPRAGM SPEAKER To test this theory one would make two experiments. (i) Lift the body by a crane, and suspend a sheet of very thick felt from the rail below the windscreen. this should effect a cure. | ||