John Breed, Diary and Training diary, item 151

• April 3, 2017 03:40:17 Cheryl Ellsworth

  False Crests

       Suppose a target at "T" with a ridge "A" of

  the same height in front of it. Then it may be difficult to

  determine whether "T" is on the ridge "A" or no, and whether

  the burst at "A" is on the same ridge as the target.

  The first point may be determined by looking at "T" from

  different points of view, for instance if a point or ridge "A"

  can be located in line with "T", then on shifting 100 yards to

  the right it will disappear to the left of "T". Similarly as

  regards the shell bursts, it is only when in line with "T"

  that it becomes puzzling, and an observer sent out

  say 200 yards to the opposite flank of the battery should

  have no difficulty in locating it.

  The difficulty is increased by the hollows in front of

  and behind the target

  
  

   Diagram of hills, labeled A, B, T, C, showing shells hitting different areas 

  
  

  A shell dropped into the deep hollow at C, will either disappear

  altogether, or the smoke, when it does appear will be at

Description