FAILURES AT PRACTICE WITH T. & P. FUZE MARK IV. 543 
yet this paper may be of some service if only as a collection of the 
possible causes of failure of metal time and percussion fuzes of the 
present service type in a convenient form for reference. 
NOTE.—This paper was written in April last and since then changes may have been made 
which may render a portion of the paper inapplicable to present conditions. I believe, for instance, 
that the position of one of the safety pins has been altered. 
