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).
The cause of humming and vibration felt on the chassis floorboards.
| Identifier | WestWitteringFiles\K\November1923\ Scan75 | |
| Date | 23th November 1923 | |
| Contd. -2- EFC4/T23.11.23. slots which are not skewed, to avoid this condition of humming. The number of teeth in this armature is 20, (two coils per slot, hand wound), as against 29 in our machine. The effect on the chassis is not only a noise, but a distinct vibration can be felt on the floorboards by the feet. EFC. | ||