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 of maximum gap-speed curves for five different special ignition coils.

Identifier  WestWitteringFiles\D\April1920\  Scan7
Date  13th April 1920
  
MAXIMUM GAP-SPEED CURVES for SPECIAL COILS.
USING 12 VOLT BATTERY AND R.R. CONTACT BREAKER
WITH SINGLE PLATINUM POINT SPARK GAP.
I
CURVE No. 1 - COIL No. S10. (x)
" " 2 - " " S12. (o)
" " 3 - " " E14. (⊗)
" " 4 - " " E18. (●)
" " 5 - " " 149* (☒)
(*STANDARD COIL)
GAP. (Inches)
.5
.4
.3
.2
.1
0
R.P.M.
200
400
600
800
1000
1200
1400
1600
1800
① ② ③ ④ ⑤
Handwritten:
PCSg
30/3/20
E.7.C
13/4/20
  
  


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