The interior of the Mk IV
 

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In this excellent video, courtesy of the Australian War Memorial in Australia, and narrated by Mike Cecil, Head of Military Heraldry and Technology in that museum, you get a absolutely unique insight in the anatomy of the Mk IV, in this case the female "Grit".

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Below some plans, showing interior detail:

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The photos below of a Mk IV Male interior were taken in the Army Museum in Brussels.
They may appear a bit random and does not cover the complete interior, simply because I did not have real access to the interior, but took these photos mainly through pistol ports, open hatches and the like. But they will still be useful, I trust, especially if you try to refer to the plan above. Click on the thumbnails to see the full pictures.

<TABLE width="93%" border=1><TBODY><TR><TD align=middle width="33%">http://www.patriotfiles.com/forum/imgcacheA/14644.png</TD><TD align=middle width="33%">http://www.patriotfiles.com/forum/imgcacheA/14645.png</TD><TD align=middle width="34%">http://www.patriotfiles.com/forum/imgcacheA/14646.png</TD></TR><TR><TD align=middle width="33%">http://www.patriotfiles.com/forum/imgcacheA/14647.png</TD><TD align=middle width="33%">http://www.patriotfiles.com/forum/imgcacheA/14648.png</TD><TD align=middle width="34%">http://www.patriotfiles.com/forum/imgcacheA/14649.png</TD></TR><TR><TD align=middle width="33%">http://www.patriotfiles.com/forum/imgcacheA/14650.png</TD><TD align=middle width="33%">http://www.patriotfiles.com/forum/imgcacheA/14651.png</TD><TD align=middle width="34%">http://www.patriotfiles.com/forum/imgcacheA/14652.png</TD></TR><TR><TD align=middle width="33%">http://www.patriotfiles.com/forum/imgcacheA/14653.png</TD><TD align=middle width="33%">http://www.patriotfiles.com/forum/imgcacheA/14654.png</TD><TD align=middle width="34%">http://www.patriotfiles.com/forum/imgcacheA/14655.png</TD></TR><TR><TD align=middle width="33%">http://www.patriotfiles.com/forum/imgcacheA/14656.png</TD><TD align=middle width="33%">http://www.patriotfiles.com/forum/imgcacheA/14657.png</TD><TD align=middle width="34%">http://www.patriotfiles.com/forum/imgcacheA/14658.png</TD></TR><TR><TD align=middle width="33%">http://www.patriotfiles.com/forum/imgcacheA/14659.png</TD><TD align=middle width="33%">http://www.patriotfiles.com/forum/imgcacheA/14660.png</TD><TD align=middle width="34%">http://www.patriotfiles.com/forum/iipcache/1140.png</TD></TR><TR><TD align=middle width="33%">http://www.patriotfiles.com/forum/imgcacheA/14661.png</TD><TD align=middle width="33%">http://www.patriotfiles.com/forum/imgcacheA/14662.png</TD><TD align=middle width="34%">http://www.patriotfiles.com/forum/imgcacheA/14663.png</TD></TR></TBODY></TABLE>These first two photos below show the Mk IV Female that can be seen in Lincoln, UK, the third the interior of a Mk IV in Australia: