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).
List of 60° range negative rotation magnetos present in the laboratory.
| Identifier | ExFiles\Box 48\2\ Scan321 | |
| Date | 16th September 1925 | |
| X8796 16.9.25. LIST OF 60° RANGE NEGATIVE ROTATION MAGNETOS AT PRESENT IN LAB. Make. Type No. Remarks. Watford. E06d. 77606 Made up-to-date. S.C. tests. " " 81062. Off test bed. " " 77696 " " " " " 71063 From Norths. S.C. tests. ------------ EFC. {E. Fowler Clarke - Electrical Engineer} | ||