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).
Performance comparison log for dynamos on 20 HP machines.
| Identifier | ExFiles\Box 165\6\ img157 | |
| Date | 1st April 1927 | |
| -3- PERFORMANCE COMPARISON OF DYNAMOS (in routine procedure of 1.4.27) SINGLE MODIFICATION 20 HP MACHINES. DYNO NO. (8) Speed for 10V 17 Amperes Speed for 17V. 8 Amperes (9) Peak Speed Amperes 2500 revs. Amperes Remarks re. communication. Remarks re. silence. P24M. OK Slight hum about 800 rpm on bench. Satisfies test dept. P6KM. OK OK T2RM.{William Robotham - Chief Engineer} OK OK L70M. OK OK 4.27. | ||