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).
Vehicle noise levels, suggesting improvements for sound measurement and reduction.
| Identifier | ExFiles\Box 154a\4\ scan0105 | |
| Date | 4th March 1939 guessed | |
| - 4 - Engine noise at low speeds is below the level of the suspension noise and so would not cause any trouble. However wind noise is quite serious at 30 MPH. This might be reduced by wind deflector screens in front of the windscreen. There is adequate room for the apparatus in 1.B.50. Sound measurements would be more satisfactory if a better microphone such as a Brush Piezo Electric was available. It is possible that such an instrument could be obtained on loan. ------------ Lr {Mr Ellor} /HWS/S.G.Lankester. S. G. {Mr Griffiths - Chief Accountant / Mr Gnapp} Lankester | ||