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 showing the brake efficiency of a post-war R. Bosch sliding armature starter motor against torque.
| Identifier | WestWitteringFiles\T\2July1929-December1929\ Scan034 | |
| Date | 25th July 1929 guessed | |
| STARTER MOTOR BRAKE EFFICIENCY R.BOSCH. SLIDING ARMATURE (POST WAR) Graph Lines: AMPERES E.H.P. B.H.P. VOLTS EFFICIENCY SPEED Vertical Axes Labels (from left to right): ELECTRICAL H.P. EFFICIENCY VOLTAGE AMPERES B.H.P. R.P.M. Horizontal Axis Label: TORQUE (POUND INCHES) Vertical Axes Scales (from left to right): Scale 1: 4.0, 3.6, 3.2, 2.8, 2.4, 2.0, 1.6, 1.2, .8, .4, .0 Scale 2: 1.0, .9, .8, .7, .6, .5, .4, .3, .2, .1, .0 Scale 3: 20, 18, 16, 14, 12, 10, 8, 6, 4, 2, 0 Scale 4: 250, 225, 200, 175, 150, 125, 100, 75, 50, 25, 0 Scale 5: 2.0, 1.8, 1.6, 1.4, 1.2, 1.0, .8, .6, .4, .2, .0 Scale 6 (R.P.M.): 3000, 2700, 2400, 2100, 1800, 1500, 1200, 900, 600, 300, 0 Horizontal Axis Scale: 0, 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, 130, 140, 150 Handwritten: 5 | ||