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).
Theoretical proposal on car body parts acting as sound amplifiers, with diagrams and a suggested experiment.
| Identifier | ExFiles\Box 12\6\ 06-page035 | |
| Date | 25th March 1931 guessed | |
| (2) the pot of the dash has to diaphram. In this way we suggest that the column and dash between them form a very good amplifier working on the principle used in diaphram 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 annotations] FIG 1 AIR 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. | ||