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 plotting armature current against coil voltage for a continuous ignition tractor.

Identifier  ExFiles\Box 163\1\  img053
Date  15th May 1939 guessed
  
CONTINUOUS IGNITION TRACTOR PETROL W.D.
Drg. UN.329 -- Curve sheet 6.
Y-AXIS: Armature Current in Amps
X-AXIS: Coil Voltage
CURVES: 120A, 800A
  
  


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