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 performance curves for a Smith (T&M) Type A Dynamo under various cell configurations.
| Identifier | WestWitteringFiles\C\August1919\ Scan51 | |
| Date | 30th June 1919 | |
| SMITH (T&M) TYPE A DYNAMO Curves of Output, Field and Control Currents when supplying 4, 5, 6 and 7 fully charged large capacity cells in series. Small figures are operating voltages. D.{John DeLooze - Company Secretary} CONTROL CURRENTS (DOTTED) 7 cells - 18.7 6 cells - 15.95 5 cells - 12.15 4 cells - 9.15 MAIN CURRENTS (FULL) 7 cells - 19.75, 18.5, 12.5 6 cells - 19.75, 16.0, 15.9, 15.8 5 cells - 12.7, 12.2 4 cells Other values on main current curves: 12.0, 11.5, 11.0, 10.5, 10.0, 9.5, 9.0 FIELD CURRENTS 7 cells - 9.2, 9.1 6 cells 5 cells 4 cells AXIS LABELS: Left Y-axis: MAIN AND CONTROL CURRENTS (AMPERES) Lower Left Y-axis: FIELD CURRENT Bottom X-axis: DYNAMO SPEED (R.P.M.) AXIS VALUES: Y-axis: -2, -1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18 X-axis: 0, 500, 1000, 1500, 2000, 2500, 3000, 3500, 4000 LOWER AXIS NOTES: 8.5 10.75 13.5 15.75 VOLTS 420 490 580 660 R.P.M. | ||