File:Mica spark plug (Manual of Driving and Maintenance).jpg

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Fig. 47  

1 Central electrode
2 Terminal nut
3 Insulator locknut, or electrode nut
4 Insulator mica rings
5 Insulator body (porcelain)
6 Assembly nut
7 Copper-asbestos washer
8 Plug body
9 Side electrode
Date
Source Scan from (1937) Manual of Driving and Maintenance for Mechanical Vehicles (Wheeled), HMSO, pp. p. 227,fig. 47
Author Andy Dingley (scanner)
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This work created by the United Kingdom Government is in the public domain.

This is because it is one of the following:

  1. It is a photograph taken prior to 1 June 1957; or
  2. It was published prior to 1974; or
  3. It is an artistic work other than a photograph or engraving (e.g. a painting) which was created prior to 1974.

HMSO has declared that the expiry of Crown Copyrights applies worldwide (ref: HMSO Email Reply)
More information.

See also Copyright and Crown copyright artistic works.

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current13:57, 19 February 2010Thumbnail for version as of 13:57, 19 February 2010707 × 712 (94 KB)Andy Dingley (talk | contribs){{Scans from 'Manual of Driving and Maintenance', 1937 |figure= |page= |title= |description= }}

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