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).
Electrical experimental record sheet for a 28-slot armature.
| Identifier | ExFiles\Box 68\4\ scan0046 | |
| Date | 19th April 1926 | |
| Y8672 ELECTRICAL EXPERIMENTAL RECORD SHEETS X.&No:- 8672 28 Slot Armature / Date on | Location. | Date off. | REMARKS. | Miles reading start. | Miles reading finish. | Miles covered. | Total miles. --- | --- | --- | --- | --- | --- | --- | --- 17-6-27 | Lab | 21-6-27 | Recd from shop. Tried in carcase of T.D. mach. B. 7° C 122°. Output low. End connection retarded one seg. B angle 13.3° Output high. | - | - | - | - 21-6-27 | Test Dept. | 27-6-27 | Sent to T.D. for trial. | - | - | - | - 27-6-27 | Lab. | 20-8-27 | Returned after trial. O.K. Tested in std. mach. CH85 B angle to give 12.0 amps 9.4° (C.122°) | - | - | - | - 20-8-27 | Shop. | 1-9-27 | | | | | 1-9-27 | Lab. | 17-10-27 | Comm skimmed. Tests in std (NB.J) carcase. Max per. setting B 13°. C 125°. Ref. perfor. curve B 15°. C 125.5°. | - | - | - | - 17-10-27 | Lab. | 6-2-28 | | | | | 6-2-28 | Shop | 17-4-28 | To be modified to new drawing giving B = 9°. | | | | 17-4-28 | Lab. | 24-4-28 | | | | | 24-4-28 | " | 30-11-28 | Max per. & Ref output in T mach. Ref curve taken on check NB machine; K 555. | - | - | - | - Completed; armature standardised. 19.4.26. | ||