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 showing the connections for an insulation testing transformer.
| Identifier | ExFiles\Box 32\4\ Scan047 | |
| Date | 31th August 1922 | |
| X.1581 <-200 volts-> Primary .648 ω Total 8200 ω 1869 ω 1065 ω 1035 ω 1035 ω 1026 ω 2150 ω Secondary + T1 T2 T3 T4 T5 T6 ++ T7 +2500 -2500 <-5000-> <-5000-> <-10000-> <-10000-> <-20000 Volts-> X.1581 CONNECTIONS OF INSULATION TESTING TRANSFORMER WD{Mr Wood/Mr Whitehead} 31-8-22 | ||