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).
Graph comparing acoustic noise meter readings for a Bentley 1B IV and a Terraplane Six against speed, with reference noise levels for various locations.
| Identifier | ExFiles\Box 138\1\ scan0114 | |
| Date | 26th June 1934 | |
| ACOUSTIC NOISE METER READINGS, BENTLEY / 1B IV, TERRAPLANE SIX, DECIBELS, SPEED IN TOP GEAR, M.P.H., GRINDING SHOP, CAR ERECTING BAY, PNEUMATIC HOSE, CHASSIS DESIGN OFFICE, E'S & H'S OFFICES., HY{Tom Haldenby - Plant Engineer}'S OFFICE, WAITING ROOM, COUNTRY ROAD., HR 91., R-LLS, 26-VI-34 | ||