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).
Drawing showing a modification to a 4 1/4 Litre Dynamo commutator to prevent oiling-up.
| Identifier | ExFiles\Box 162\1\ img004 | |
| Date | 30th April 1938 | |
| G.W.H. 10. HOLE 1/8 DIA. DEPOT MODIFICATION TO PREVENT OILING-UP OF COMMUTATOR. 4 1/4 LITRE DYNAMO. O.B. 1147. 15° KINGSBURY 30.4.38. | ||