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 different RPMs and brush settings.
| Identifier | ExFiles\Box 168\3\ img156 | |
| Date | 5th April 1939 | |
| COMMUTATOR DISTRIBUTOR PRIMARY VOLTAGE CURVES VCH 9 NEGATIVE BRUSH RETARDED 850 R.P.M. VOLTS 100 50 0 -50 -100 NEGATIVE BRUSH ADVANCED 850 R.P.M. NEG BRUSH RET 2250 R.P.M. VOLTS 100 0 -100 NEG BRUSH ADVd 2250 R.P.M. S.G.L. / 5.4.39 | ||