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).
Data table and diagram showing the currents for a Smith (T & M) Type 'A' Dynamo.
| Identifier | ExFiles\Box 3\5\ 05-page106 | |
| Date | 1st July 1919 | |
| SMITH (T & M) TYPE 'A.{Mr Adams}' DYNAMO. TABLE OF CURRENTS. Speed. Main current. (M). Field current (F). Control current (C) control brush current. Main brush current (M+F-C). 580 0 2.8 -1.4 4.2 750 5.65 3.0 2.65 6.0 (920) (9.9) (3.15) (6.80) 1000 11.0 3.2 8.0 6.2 1250 12.45 3.2 10.95 4.7 1500 12.9 3.25 12.75 3.35 1750 12.95 3.2 13.6 2.55 2000 12.65 3.2 14.05 1.8 2250 12.45 3.2 14.4 1.25 2500 12.05 3.2 14.65 .6 2750 11.9 3.15 14.9 .15 (2.950) (15.0) 3000 11.8 3.1 15.1 -.2 3250 11.7 3.1 15.3 -.5 3500 11.6 3.1 15.35 -.65 Handwritten notes: C = 1/2(M+7) nearly C = M+F Diagram labels: M+F-C M+ A+ C A- M- Maximum current 15.35 amperes. Brush contact area = .75 x .375 = .281 Amperes per square inch (max) = 54.6. | ||