Image: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 :
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
Date

details correct as at 1 August 1914
Author

War Office, UK
Permission
(Reusing this image)

Crown Copyright expired (50 years)

Public domain This artistic 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 created by the United Kingdom Government and taken prior to 1 June 1957; or
  2. It is a photograph or an engraving created by the United Kingdom Government and commercially published prior to 1958; or
  3. It is an artistic work other than a photograph or engraving (e.g. a painting) which was created by the United Kingdom Government prior to 1958.

More information. See also Copyright, Crown copyright artistic works and HMSO Email Reply.

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Date/TimeDimensionsUserComment
current11:45, 27 May 2008680×800 (80 KB)Rcbutcher (Previous 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 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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