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 of connections for a Weston Box Instrument No. 92.
| Identifier | ExFiles\Box 33\4\ Scan187 | |
| Date | 21th February 1920 | |
| X. 1782 21/2/20 Instrument Resistance wound on magnet 1.5 1.5 VOLTS Throwover Switch AMPERES 600 150 + - Amps. + External Shunt X1482 Diagram of connections of Weston Box Instrument No 92 21/2/20. RCP. | ||