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 on an experimental motor fitted with C.M. 3 brushes and E.7180 springs.
| Identifier | ExFiles\Box 35\1\ scan 035 | |
| Date | 31th October 1919 | |
| X. 2656 Mr. Clark. 31.10.19. X.3345 TEST OF EXPL MTOROR FITTED WITH C.M. 3 BRUSHES AND E.7180 SPRINGS. X.2656 The motor was loaded up to take 140 amps. the torque then being 468 lb/inches it ran at this load for 20 mins without any sign of bad commutation or brush trouble. It was thought advisable to stop it at the end of 20 mins owing to the heating up. (Sgd) L.F. | ||