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).
Comparative table of test results for various magneto models, detailing break points and performance speeds.
Identifier | ExFiles\Box 4\5\ 05-page167 | |
Date | 23th March 1921 guessed | |
-2- A.{Mr Adams} Magneto. | Degrees of make. | Maker's make advanced. | Maker's break advanced. | Our break advanced. | Our break retarded. | Lowest speeds for 5.5 mm. | Remarks. ---|---|---|---|---|---|---|--- | | | | | | Adv. | Cent. | Rtd. | Watford. | 154.5 | -57° | 97.5° | 97.5 | 131.5 | 150 | 250 | 340. | Magneto No.49638 " | 155 | -59° | 96° | 94.5 | 128.5 | 156 | 226 | 320. | " " 45168. " | 163.5 | -78.5° | 85° | 85° | 117° | 160 | 140 | 136 | Maker's range. " | 160.0 | -92° | 67° | 96 | 130 | 160 | 150 | 150. | Retd posn. same as maker's. Adv. posn. 29° later than maker's. A.Bosch. | 82.5 | +11.5° | 94° | 94 | 128 | 260 | 170 | 246. | Adv. posn. same as makers Retd. posn. 3.5° earlier than makers. U.S.A. Bosch. | 153 | -53.5° | 99.5 | 99.5 | 133.5 | 120 | 162 | 240. | Adv. posn. same as makers. Retd. posn. 3.5° earlier than maker's. U.S.A. Bosch. | 155.5 | -79° | 76.5 | -- | -- | 150 | 250 | 530. | Maker's range. Dixie. | 73.5 | -20° | 53.5° | -- | -- | 180 | 180 | 185. | Low speed sparking unaltered by advancing. Conner. | 78 | +14.5° | 92.5° | 107 | 141 | 350 | 260 | 170. | Retd. posn. same as maker's Adv. posn. 14.5° later than maker's. B.T.H. | 100.0 | -27.5° | 72.5° | 62.5 | 96.5 | 244 | 192 | 220. | Datum slightly indefinite. Full adv. not secured owing to fouling. Contd. [Text in right margin, vertically] A.D.O. SHT. No. T105-B-1123 | ||