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).
Confirming a modification instruction for the 20 HP & 40/50 HP switchbox.
| Identifier | ExFiles\Box 56\4\ Scan136 | |
| Date | 5th April 1928 | |
| EFC. --- X5430 BY/Cgh{W Clough}12/G5.4.28. 20 HP. & 40/50 HP. SWITCHBOX. X8730 In reply to EFC7/T.30.3.28. please note that the modification to the switchbox to ensure the breakage of the field circuit of the dynamo before that of the armature circuit, has already been instructed for production. BY/Cgh.{W Clough} | ||