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 characteristic graph for a motor with five Y-axes.
| Identifier | ExFiles\Box 179b\2\ img131 | |
| Date | 12th November 1932 guessed | |
| MOTOR EFFICIENCY VOLTAGE AMPERES B.H.P R.P.M Efficiency Scale: 0, 15, 30, 45, 60, 75 Voltage Scale: 0, 2, 4, 6, 8, 10, 12, 14, 16, 18, 20 Amperes Scale: 0, 20, 40, 60, 80, 100, 120, 140, 160, 180, 200 B.H.P Scale: 0, 10, 20, 30, 40, 50, 60, 70, 80, 90, 100 R.P.M Scale: 0, 400, 800, 1200, 1600, 2000, 2400, 2800, 3200, 3600, 4000 X-Axis Scale: 0, 5, 10, 15 | ||