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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).
Oscillograms of radio interference from a Buick 8 engine running at 2000 r.p.m.

Identifier  ExFiles\Box 27\3\  Scan067
Date  29th March 1939 guessed
  
OSCILLOGRAMS TAKEN OF RADIO
INTERFERENCE FROM BUICK 8.
Engine running at 2000 r.p.m.

1)
Interference at television w/length
No suppressor fitted. Plug screen on

2)
Interference at television w/length
as ① but with plug screen off.

3)
Interference at television w/length
Suppressor and plug screen fitted

4)
Interference at 350 m.{Mr Moon / Mr Moore}
Background only.
nb. sens'y increased x6.

5)
Interference at 350 m due to car engine, suppressor fitted.

6)
As ⑤ but with no suppressor fitted.
  
  


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