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).
Test report for Motor No. 74 fitted with extra strong springs and C.M.3 brushes.
| Identifier | ExFiles\Box 35\1\ scan 031 | |
| Date | 16th October 1919 | |
| X.2656 X.3082. X.2656. X.3348. Mr. Clark. 16-10.19. MOTOR No.74 FITTED WITH EXTRA STRONG SPRINGS AND C.M.3 BRUSHES. Light. After half an hour. 20 amps. 5.5 volts. After 45 mins. 19.3 amps. 5.7 volts 595 speed. Load. (After 15 mins). 144 amps. 9.53 volts 165 speed. 30.0 10.0 Normal torque. At this point the motor was very hot particularly the brush gear which was smoking. The motor ran well throughout. (sgd) L.F. | ||