John Breed, Diary and Training diary, item 73

• March 27, 2017 03:13:57 Cheryl Ellsworth

  N.B; The angle of Elevation and the Quadrant-Angle

  are the same when the lone of sight is horizontal

  
  

   Drawing of a diagram showing the relationship between line of sight, axis of gun (or piece), angle of sight, angle of elevation, quadrant angle, and horizontal plane 

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  Line of Departure the direction of the projectile on leaving the

  muzzle, or in other word a tangent to the

  projectile at the muzzle

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  Plane of Departure; the vertical plane passing the

  line of departure

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  Angle of Departure; The angle between the line of departure

  and the horizontal plane in other words

  the Quadrant angle plus jump

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  Battery angle The Angle formed by lines Drawn

  from the Target + O.Str to the Battery

Description