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 17-slot armature.
| Identifier | ExFiles\Box 34\3\ Scan146 | |
| Date | 26th February 1918 guessed | |
| RR STARTER MOTOR BRAKE EFFICIENCY TEST X.2642 (17 SLOT ARMATURE) EFFICIENCY VOLTAGE AMPERES HORSE POWER TORQUE (POUND INCHES) SPEED (R.P.M.) ELECTRICAL H.P. DELIVERED TO MOTOR VOLTS ON TERMINALS EFFICIENCY B.H.P AMPERES. TORQUE | ||