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).
Graph of Commutator Distributor Primary Voltage Curves at various RPMs and brush settings.
| Identifier | ExFiles\Box 164\5\ img426 | |
| Date | 5th April 1939 | |
| COMMUTATOR DISTRIBUTOR PRIMARY VOLTAGE CURVES VCH 9 850 R.P.M. NEGATIVE BRUSH RETARDED VOLTS 100 50 0 -50 -100 850 R.P.M. NEGATIVE BRUSH ADVANCED 2250 R.P.M. NEG. BRUSH RET. VOLTS 100 50 0 -50 -100 2250 R.P.M. NEG. BRUSH ADV'D VOLTS 100 0 -100 S.G.L. 5. 4. 39 | ||