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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).
Remedies for electrical interference from windscreen wipers, petrol pumps, and car heaters.

Identifier  ExFiles\Box 168b\1\  img272
Date  6th May 1938 guessed
  
8
The best cure for this is to fit a spring onto the dust cap & have a small copper stud on to other end (Fig 5). This stud should bear on the centre of the axle, this will as a rule remove this interference.

Windscreen Wipers
The most effective remedy for this is to connect a 1/2 mfd condenser across one terminal to earth.

Elec Petrol Pump
Interference from this source may be removed by fitting a 1/2 mfd condenser between the pump terminal + earth.

Car Heater.
If interference occurs from this source it may be cured by exactly the same treatment as prescribed for windscreen wipers.
  
  


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