Continuation detailing the performance of a 19-slot armature compared to a 29-slot design.
| Identifier | WestWitteringFiles\N\July1925-September1925\ Scan138 | |
| Date | 25th September 1924 | |
| R.R. 493A (50H) (D.B. 175 25-9-24) J.H.D. EXPERIMENTAL REPORT. Contd. -4- Expl. No. 4121 REF: DYN/Tec.8.25. position than for the 9°, probably due to the use of a different carcase). In operation the 19 slot armature seems to hum at certain speeds; otherwise, in commutation, etc., it is quite equal to the 29 slot, two coil per slot design. Machine B is being prepared for use on a chassis, with the 19 slot armature and 11° main brush retard, the control being fixed at 120°, the position found for the 11° curve(5) plotted. EFC. {E. Fowler Clarke - Electrical Engineer} Photostat attached. | ||
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).