File:HotchkissMkIVBasePercussionFuze.jpg

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Description

Diagram of British Hotchkiss Mk IV base percussion fuze.
Body is of copper alloy Class A. Height approximately 40mm, diameter 25mm (widest), 12.5mm (narrowest), 17mm (cap).
Action :
On shock of discharge, the pellet sets back over the needle holder, thus allowing the steel needle to project beyond it. The alloy at the bottom of the pellet cushions against the bottom of the fuze, and a small portion of it dovetails into the undercut recess, round the base of the needle. This forms a weak connection between the pellet and fuze body, and assists the spring in checking rebound action.
On graze or impact the pellet and needle set forward, the needle pierces the detonator, and the flash passes through to the bursting charge of the shell.
For use with Common and Steel shells in the following guns :

Date details correct as at 1 August 1914
Source

Figure 85, Page 298-299, 304 in "Treatise on Ammunition" 10th Edition, 1915


Facsimile reprint by Imperial War Museum and Naval & Military Press, 2003
Author War Office, UK
Permission
(Reusing this file)		 Crown Copyright expired (50 years)


Public domain
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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Date/TimeThumbnailDimensionsUserComment
current11:45, 27 May 2008Thumbnail for version as of 11:45, 27 May 2008680 × 800 (80 KB)RcbutcherPrevious version was optised for screen set to gamma = 0.5, which made it appear too faint on most screens. This version is enhanced and optimised for screens set to gamma = 1.0 i.e. most.
07:30, 22 April 2008Thumbnail for version as of 07:30, 22 April 2008680 × 800 (81 KB)Rcbutcher{{Information |Description=Diagram of British Hotchkiss Mk IV base percussion fuze. <br>Body is of copper alloy Class A. Height approximately 40mm, diameter 25mm (widest), 12.5mm (narrowest), 17mm (cap). <br>Action : <br>On shock of discharge, the pellet
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