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).
Three methods of insulation for the power unit, car body, and passengers.
| Identifier | ExFiles\Box 105\1\ scan0064 | |
| Date | 5th May 1930 | |
| R1/M5.5.30. contd. -2- We have then :- (1) The power unit and gearbox insulated from the frame (rubber). (2) The body insulated from the frame (rubber) (3) The passengers insulated from the body (good cushions). All of which are possible, and should be uniformly carried out. This has not much bearing on booming, which may come through the air. R.{Sir Henry Royce} | ||