John Breed, Diary and Training diary, item 123

• March 29, 2017 23:07:02 Cheryl Ellsworth

   Drawing of different trajectories, labeled A, a, b, c 

  
  

  Now if we take any given distance, say 50 yards, as the

  correct distance short, and if in figures we measure up

  to 50 yards along the trajectory at a number of different

  ranges, to the points a, b, and c we shall find that these

  points, as seen from the gun are practically in the same

  straight line. If therefore we measure the angle A, and 

  find it to be say 15 minutes then if we elevate the sighting

  telescope or director telescope 15 minutes above the target

  any bursts which appear on the cross wires will be the

  correct distance from the target.

  In fixing the proper distance of the burst, and thence

  the angle A for any gun, regard must also be had

  to the mean error of the fuze.

  This subject involves the Theory of Probabilities and cannot

  be adequately dealt with in the present work. But it is

  clear that if shrapnel fuzed alike burst at a distance

  varying by a  [sic]  much as 150 yards, a good many of the

• March 29, 2017 21:28:56 Cheryl Ellsworth

   Drawing of different trajectories, labeled A, a, b, c 

  
  

  Now if we take any given distance, say 50 yards, as the

  correct distance short, and if in figures we measure up

  to 50 yards along the trajectory at a number of different

  ranges, to the points a, b, and c we shall find that these

  points, as seen from the gun are practically in the same

  straight line. If therefore we measure the angle A, and 

  find it to be say 15 minutes then if we elevate the sighting

  telescope or director telescope 15 minutes above the target

  any bursts which appear on the cross wires will be the

  correct distance from the target.

  In fixing the proper distance of the burst, and thence

  the angle A for any gun, regard must also be had

  to the mean error of the fuze.

  This subject involves the Theory of Probabilities and cannot

  be adequately dealt with in the present work. But it is

  clear that if shrapnel fuzed alike burst at a distance

  varying by a  [sic]  much as 150 yards, a good many of the

  
  

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• March 29, 2017 21:28:36 Cheryl Ellsworth

   Drawing of different trajectories, labeled A, a, b, c 

  
  

  Now if we take any given distance, say 50 yards, as the

  correct distance short, and if in figures we measure up

  to 50 yards along the trajectory at a number of different

  ranges, to the points a, b, and c we shall find that these

  points, as seen from the gun are practically in the same

  straight line. If therefore we measure the angle A, and 

  find it to be say 15 minutes then if we elevate the sighting

  telescope or director telescope 15 minutes above the target

  any bursts which appear on the cross wires will be the

  correct distance from the target.

  In fixing the proper distance of the burst, and thence

  the angle A for any gun, regard must also be had

  to the mean error of the fuze.

  This subject involves the Theory of Probabilities and cannot

  be adequately dealt with in the present work. But it is

  clear that if shrapnel fuzed alike burst at a distance

  varying by a [sic] much as 150 yards, a good many of the

  
  

  • Show revision
  • Compare to current version
  • Compare to previous version

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