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).
Performance graph of generator EX.17431 showing Amperes vs RPM under various conditions.
| Identifier | ExFiles\Box 60\4\ Scan219 | |
| Date | 14th November 1933 | |
| PERFORMANCE OF EX. 17431 GENERATOR ALSO EX.17671 - EX.17941 AMPERES 20 16 12 8 4 0 R.P.M. 800 1600 2400 3200 4000 4800 5600 6400 COLD-LIGHTS ON HOT-LIGHTS ON COLD-LIGHTS OFF HOT-LIGHTS OFF J.B.H 11-14-33 CURVE 4064 # 4064 KEUFFEL & ESSER Cº N. Y. | ||