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.
| Identifier | ExFiles\Box 62\3\ scan0161 | |
| Date | 1st April 1927 | |
| -2- O/50 N.B. MACHINES PERFORMANCE COMPARISON OF DYNAMOS. (On routine procedure of 1.4.27) Column Headers: Dynamo. | (4) Speed for 10V. 14V. 17V. | (5) Speed for 0 amperes. | Peak Speed. | Peak Amperes. | 3,400 RPM amperes. | (6) Speed for 10V. 13.6V. 17V. | (7) speed for amperes 0. 8. 15. Table Data: XI.15.ss.{S. Smith}x | 755 | 755 | 1590 | 11.8 | 8.1 Y.55.M. | 785 | 785 | 1550 | 12.7 | 9.1 Y.65.M. | 800 | 800 | 1650 | 11.2 | 8.0 Y.75.M. | 745 | 745 | 1550 | 11.0 | 7.9 Y.85.M. | 770 | 770 | 1570 | 11.6 | 8.1 Y.95.M. | 815 | 815 | 1560 | 12.8 | 9.4 | ||