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).
Production inspection and test log for a Watford Type E06 (d) Magneto.
| Identifier | ExFiles\Box 48\2\ Scan335 | |
| Date | 24th November 1925 | |
| X.8781m - WATFORD TYPE E06 (d) MAGNETO. X.[struck through] 8796 PRODUCTION INSPECTION AND TEST. Date. | Magneto No. | (1) Remarks. | (2) Range (degrees) (>58°) | (3) Remarks. | (4) Tangl. Force 3 to 5 lbs. | (5) Remarks. | (6) Remarks. | (7) Min. sparking speeds. (a) (<280) | (b) (<210) | (c) (<190) --- 19-1-25 | 68109 | OK | 57° | OK | 4 ½ lbs | OK | OK | 150 | 140 | 135 20-1-25 | 70037 | OK | 62° | OK | 4 lbs | OK | OK | 190 | 165 | 145 21-1-25 | 73973 | Noisy - cam ring slack | 59° | OK | 3 ½ lbs | OK | OK | 210 | 190 | 180 27-2-25 | 73970 | Sleeves occasionally jam with armature | 59° | OK | 4 lbs | OK | OK | 196 | 180 | 170 27-2-25 | 73971 | Cam ring slack laterally | 59° | OK | 3 lbs | on O.C. sparks jump from slip ring | OK | 245 | 205 | 180 15-6-25 | 77606 | OK | 59° | OK | 3 lbs | OK | OK | 165 | 135 | 120 30-6-25 | 82558 | OK | 63° | OK | 2 ¾ lbs | OK | OK | 235 | 215 | 200 9-9-25 | 71063 | OK | 66° | OK | | on OC sparks jump slip ring | OK | 320 | 190 | 195 24-11-25 | 73970 | Slight end play in armature | 63° | OK | 2 lbs | OK | OK | 210 | 160 | 160 Faint text: 73972 Bottom left: 21.1.25 Right margin, vertical: X.8796 | ||