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).
Record of testing, failure, and repair for ignition coils TG2 and TG3.
| Identifier | ExFiles\Box 45\4\ Scan145 | |
| Date | 7th February 1923 | |
| X4079 EFC/T7.2.23. X.4079 - IGNITION COILS Mr. Brock's second long coil(TG2) handed to Mr. Warwick to be put on the test bed engine on 23.1.23. Coil TG3 was put on 4GII car for Mr. Royce on . 23.1.23. Returned on car early in February, failing on the way. Coil since tested by C.A.P. and pronounced O.K. except for coil case crack. Coil then handed to Mr. Brock for repair. E.F.C. EFC. | ||