John Breed, Diary and Training diary, item 113

• March 29, 2017 03:29:48 Cheryl Ellsworth

  Note

       The Mark IV fuze is made of aluminum, except

  when otherwise stated and consists of the following principal

  parts;

       Body with brass ring, top and bottom composition

  rings, two waterproofed cloth washers, cap with set screw,

  base plug, time and percussion arrangements, and brass

  cover.

  The lower portion of the body is screwed to receive a holder

  for the percussion arrangement, and the upper portion forms

  a stem containing the time detonator pellet and its stirrups

  springs. The shoulder or flange of the body is fitted with

  a brass ring, to the lower part of which the lugs cover is

  screwed.

  The upper part of the brass ring is graduated from 0 to 22

  each graduation being divided into 10 parts; a square

  notch is cut for the No 14 Mark II  fixing key, and a small

  cross to denote safety point. A recess is turned on the

  under side of the brass ring to fit over the nose of the shell

  and is provided with a better washer soaked in mineral

  jelly

  A pin is screwed into the lower time ring to form a

  P.T.O
  

Description