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).
Instruction regarding the correct connection of a filter unit for future radio installations in cars.
| Identifier | ExFiles\Box 63\3\ scan0272 | |
| Date | 27th February 1935 guessed | |
| -2- We therefore wish to ensure that on all future radio installations on our cars (both R.R. and Bentley) you will take particular care not to connect your filter unit to the field circuit of the dynamo. Yours faithfully, FOR ROLLS-ROYCE LIMITED. | ||