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 results for an experimental motor fitted with extra strong springs and C.M. brushes.
| Identifier | ExFiles\Box 35\1\ scan 032 | |
| Date | 20th October 1919 | |
| Mr. Clark. 20.10.19. EXPL. MOTOR FITTED WITH EXTRA STRONG SPRINGS AND C.M. BRUSHES. Light. 14.0 amps. 5.92 volts 620 speed. Load. 104 amps. 9.83 volts 185 speed. spring balance 11.0 load 31.0 Motor ran well for whole period (20 mins) It did not get so hot as No.74. (Sgd) L.F. | ||