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 showing the results of a starter motor brake efficiency test for a 45 slot armature.
| Identifier | ExFiles\Box 34\3\ Scan159 | |
| Date | 12th April 1918 guessed | |
| R.R. STARTER MOTOR BRAKE EFFICIENCY TEST X 2642 (45 SLOT ARMATURE) (FIELD COILS TWO SERIES TWO PARALLEL) EFFICIENCY VOLTAGE AMPERES HORSE POWER TORQUE (POUND INCHES) SPEED (R.P.M.) CURVE LABELS: EFFICIENCY VOLTS ON TERMINALS B.H.P. AMPERES HALF ELECTRICAL H.P TORQUE | ||