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 for a generator plotting Amperes against R.P.M. under hot/cold and lights on/off conditions.
| Identifier | ExFiles\Box 60\4\ Scan220 | |
| Date | 14th November 1933 | |
| PERFORMANCE OF EX 17431 GENERATOR ALSO EX 17671 - EX 17341 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 CURVE 4064 J.B.H. 11-14-33 # 4064 KEUFFEL & ESSER CO. N. Y. | ||