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).
Fitting an experimental insulated ignition switch to an engine.
| Identifier | ExFiles\Box 31\2\ Scan036 | |
| Date | 22th April 1910 guessed | |
| M13 Extract from Works A.P. 21915 filed in A.1000. ~~~~~ To R.y. Re. 49 J.B. ~~~~~ We shall be able to fit the following experimental part to the above engine :- Insulated Ignition Switch [Signature] | ||