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).
Preliminary test report on a 20 hp H-O Dynamo with field resistance.
| Identifier | ExFiles\Box 68\4\ scan0306 | |
| Date | 12th February 1930 | |
| RR 388 (150 BKS.) (OB 461-8-12-24) MP 306975 ROLLS-ROYCE LTD. INSTRUCTIONS. To EFC Order No. AD Customer's No. X5663 20 hp H-O Dynamo with Field Resistance (Preliminary) A rough test has been carried out on dynamo N having 48 coil armature and unsymmetrical poles to ascertain what resistance inserted in the field would be capable of dissipating the maximum possible wattage with the machine working on a system at schedule voltage and also what the peak output of the machine would be with such a resistance inserted. The dynamo was got to an intermediate temperature and various resistances inserted whilst speed was varied until first, the maximum field current and next, peak output were obtained. Signed (Cont d) This Sheet must be filed on completion of the work. | ||