Rolls-Royce Archives
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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).
Graph showing the variation of maximum gap with the number of secondary turns for special battery ignition coils.

Identifier  WestWitteringFiles\D\April1920\  Scan9
Date  13th April 1920
  
X.3775. VARIATION
OF
MAXIMUM GAP AT 50 S.P.S.
WITH
NUMBER OF SECONDARY TURNS
FOR
SPECIAL R.R. BATTERY IGNITION COILS
WITH
STANDARD
PRIMARY
CONDITIONS.

MAXIMUM GAP (Inches) AT 500 R.P.M.
(for coils nos. S10, S12, E14, E18 & Standard)

No. OF SECONDARY TURNS.

COIL NO. S.10. x BARE DIA. OF SECONDARY WIRE .006
" " S.12. O " " " " .0035
" " E14. ⨂ " " " " .004
" " E18. ● " " " " .0035
" " 149. ⮾ * " " " " .0035

(* STANDARD COIL.)

RCS / 31/3/20
E>C
13/4/20
  
  


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