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).
Blueprint detailing a depot modification to prevent the oiling-up of a commutator for a 4 1/2 litre dynamo.
| Identifier | ExFiles\Box 162\1\ img002 | |
| Date | 30th April 1938 | |
| G.W.H. 10 HOLE 1/8 DIA DEPOT MODIFICATION TO PREVENT OILING-UP OF COMMUTATOR 4 1/2 LITRE DYNAMO. D.B. 1147 15° KINGSBURY 30.4.38 | ||