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, detailing tests, modifications, and mileage.
| Identifier | ExFiles\Box 68\4\ scan0040 | |
| Date | 19th April 1926 | |
| ELECTRICAL EXPERIMENTAL RECORD SHEETS X-8672 X. & No: - 8672 28 Slot Armature 3 Date on. | Location. | Date off. | REMARKS. | Miles reading start. | Miles reading finish. | Miles covered. | Total miles. ---|---|---|---|---|---|---|--- 25-6-27 | Lab. | 15-7-27 | Recd from shop. Made to drawing. B angle in std carcase 7°. Output low. B of 11° gave peak of 11.3 amps. | — | — | — | — 15-7-27 | Shop | 10-8-27 | Returned to have comm retarded 2.5° giving B = 9.6°. | | | | 10-8-27 | Lab | 22-8-27 | Recd from shop. Tests in std. (N.B.J) carcase. Also per. setting B.9.1°. C.122.5°. Ref. per. curve B.9.1° C 123°. | — | — | — | — 25-8-27 | " | 7-11-27 | | — | — | — | — 7-11-27 | " | 17-11-27 | Tried in modified machine from J.D. B 14.5°. C 121.5 Peak 13.600. Std. arm. B 15° C 121.5°. Peak 12.4a. Magnetic noise eliminated but mechanical noise had taken its place. | — | — | — | — 17-11-27 | " | 6-2-28 | Tried in a second modified machine. B. 16° C 121°. Peak 16.5 a.{Mr Adams} Std arm. B 17°. C 121°. Peak 17.0 a.{Mr Adams} Machine quietened. | — | — | — | — 6-2-28 | " | 1-3-28 | Put in carcase of K mach. & sent to MPO. shop for 12 Ex. | — | — | — | — 1-3-28 | Shop | 22-3-28 | | | | | 22-3-28 | 12 Ex | 31-3-28 | Reading taken | 7,271 | 7,311 | 40 | 40 31-3-28 | " | 20-6-28 | " | 812 | 6,258 | 5,446 | 5,486 20-6-28 | " | 2-7-28 | " | 6,258 | 7,048 | 790 | 6,276 2-7-28 | " | 19-7-28 | " | 7,048 | 7,987 | 935 | 7,211 19-7-28 | " | 13-8-28 | " | 7,987 | 9,264 | 1,277 | 8,488 13-8-28 | " | 6-9-28 | " | 9,264 | 10,722 | 1,458 | 9,946 6-9-28 | " | 18-9-28 | " | 10,722 | 10,722 | | 18-9-28 Experiment completed and 28 slot type armature standardized. 19.4.26. | ||