File:BL 12 inch Mk VIII gun breech diagram Brasseys 1899.jpg

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BL_12_inch_Mk_VIII_gun_breech_diagram_Brasseys_1899.jpg ‎(769 × 589 pixels, file size: 106 KB, MIME type: image/jpeg)

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Diagram showing breech mechanism of British BL 12 inch Mk VIII naval gun.

  • A : Bronze end plate, with handle at bottom for withdrawing, on toip is a recess for attachment of a cam lever if usual working fails.
  • C : Frame Breech Mechanism is a circular bronze plate attached to the breech face by 6 screws.
  • D : Bronze Ring carrier
  • E : Steel plate with inner face cut away to form an eccentric groove, called the roller path, on the side of which the friction roller of a crank acts to turn the breech screw.
  • F : Steel roller, assists moving obturator and screw from its seating.
  • G : Piston of the buffer
  • H : Upper part of Hinge bolt
  • I : Gun-metal bush
  • J : Friction roller
  • K : Bevel wheel
  • L : Lower part of Hinge bolt
  • M : Wheel bevel
  • N : Steel contact bolt
  • O : Steel rack pinion
  • P : Metal roller frame
  • Q : Bronze worm wheel
  • R : Frame bearings
  • S : Handle
  • T : Clutch
  • U : Forked lever clutch
  • V : Guide bolt
  • W : Clutich pinion
  • X Automatic pinion
The breech is opened by turning hand wheel S.
Date circa. 1895 - 1899
Source Brasseys Naval Annual 1899. Downloaded from Great War Primary Document Archive at http://www.gwpda.org/naval/brassey/b1899o05.htm
Author artist not identified. Assumed for British government.
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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)
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current14:24, 6 December 2008Thumbnail for version as of 14:24, 6 December 2008769 × 589 (106 KB)Rcbutcher (talk | contribs){{Information |Description=Diagram showing breech mechanism of British BL 12 inch Mk VIII naval gun. |Source=Brasseys Naval Annual 1899. Downloaded from Great War Primary Document Archive at http://www.gwpda.org/naval/brassey/b1899o05.htm |Date=circa. 189

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