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 the connections of an auto charge control switch.
| Identifier | ExFiles\Box 59\1\ Scan322 | |
| Date | 5th April 1928 | |
| [ "X4008.", "TO DYNAMO TERMINAL C.", "RESISTANCE", "START", "FINISH", "COPPER", "N", "TO EARTH", "SUPPLY", "FROM DIS. BOX TERMINAL C.", "FROM DIS. BOX TERMINAL B.", "CONNECTIONS OF AUTO CHARGE CONTROL SWITCH", "5/4/28", "ROLLS-ROYCE LTD.", "PRINT ROOM", "14 APR 1928", "DERBY" ], | ||