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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).
Table of minimum sparking speeds for various post-war Bosch and B.T.H. magneto models.

Identifier  ExFiles\Box 4\5\  05-page134
Date  28th January 1921 guessed
  
Contd.
-2-
post-war models of Bosch magnetos and the B.T.H. type "PM" magneto

MINIMUM SPARKING SPEEDS.

Full Advance. Full Retard. Angle of Adjustment.

Bosch "ZU4" 76 RPM 155 RPM 35Q°
Bosch "ZR6" 80 R.P.M. 130 RPM 35Q°
Bosch "Z4" 64 RPM 64 RPM 35Q°
B.T.H. "PM4" 52 RPM 52 RPM 45Q°
  
  


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