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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
  
  


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