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 output, field, and control current curves for a Smith Type A Dynamo with varying numbers of cells.
| Identifier | ExFiles\Box 3\5\ 05-page105 | |
| Date | 29th September 1920 | |
| 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 S.S. Co. LTD. Markings in amperes MAIN CURRENT AMPS FIELD AND CONTROL CURRENT AMPS DYNAMO SPEED (R.P.M.) 9.5 10.75 13.5 15.75 VOLTS 420 490 580 660 R.P.M. CONTROL CURRENTS (DOTTED) 7 cells 6 cells MAIN CURRENTS (FULL) 7 cells 6 cells 5 cells 4 cells FIELD CURRENTS 7 cells 6 cells 5 cells 4 cells D.{John DeLooze - Company Secretary} E.G.C. Co Ld 836 29.9.20 | ||