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 table for various dynamo models based on a routine procedure.
| Identifier | ExFiles\Box 62\3\ scan0162 | |
| Date | 1st April 1927 | |
| (3) 40/50 N.B. DYNAMOS. PERFORMANCE COMPARISON OF DYNAMOS. (On routine procedure of 1.4.27). (8) (9) Dynamo Speed for 10V. 14V. 17V. Speed for 0 amperes at 12.4 V.{VIENNA} Peak. Speed. Amperes 2500 RPM amperes Remarks re commutation. Remarks re silence. XI.15.SS.{S. Smith}X O.K. O.K. Y.55.M O.K. O.K. Y.65.M O.K. O.K. Y.75.M O.K. O.K. Y.85.M O.K. O.K. Y.95.M O.K. O.K. | ||