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).
Wiring diagram for an electro-magnetic field resistance inserting switch unit.
| Identifier | ExFiles\Box 59\1\ Scan243 | |
| Date | 3rd February 1928 | |
| X.4008 To EARTH To DYNAMO TERMINAL C RESISTANCE SHUNT FROM DIS. BOX TERMINAL B FROM DIS. BOX TERMINAL C CONNECTIONS OF ELECTRO-MAGNETIC FIELD RESISTANCE INSERTING SWITCH UNIT C 90 / 23830 ROLLS-ROYCE, LIMITED FIRE ROOM, 3 FEB 1928 DERBY | ||