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 performance test curves for a Bosch starter motor.
| Identifier | ExFiles\Box 61b\3\ scan0328 | |
| Date | 24th January 1934 guessed | |
| STARTER MOTOR TEST CURVES MOTOR:- BOSCH Nº:- B.G.C. 9.9/12 EFFICIENCY VOLTAGE AMPERES B.H.P. R.P.M. TORQUE (POUND INCHES) SPEED | ||