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 open circuit voltage curves for a Smith (T&M) Type A Dynamo with separate excitation.
| Identifier | WestWitteringFiles\C\August1919\ Scan50 | |
| Date | 13th June 1919 | |
| SMITH (T&M) TYPE A DYNAMO OPEN CIRCUIT VOLTAGE CURVES SEPARATE EXCITATION VOLTS 90 80 70 60 50 40 30 20 10 0 FIELD AMPERES 0 1 2 3 4 5 MAIN VOLTAGE 2500 R.P.M. MAIN VOLTAGE 1500 R.P.M. VOLTAGES BETWEEN MAIN -VE AND AUXILIARY -VE BRUSHES 2500 R.P.M. 1500 R.P.M. A E.7.C. 13/6/19 | ||