John Breed, Diary and Training diary, item 76

• March 27, 2017 03:32:46 Cheryl Ellsworth

  Point Blank Range; Is the range due to the jump of the gun

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  Drift; The constant deflection of the projectile from the plane

  of departure due to the rotation imparted by the rifling

  
  

  Note
  

  Drift is compensated for in guns by placing the
  

  tangent sight in the gun at a permanent angle of set
  

  but in the 18 Scr 6 F the right trunnion of the Cradle
  

  is a 1 1/2 degrees higher than the left
  

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  Battery Angle; The angle formed at the Battery by imaginary

  lines drawn to the target and the Observing Station
  

  __________________________________

  Muzzle Velocity; The velocity in feet per second with which a

  projectile leaves the muzzle
  

  __________________________________
  

  Maintaining Velocity; The velocity of the projectile at any given

  point of its trajectory
  

  _________________________________

  Striking Velocity The velocity of the projectile at the point

  of impact
  

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• February 24, 2017 20:33:27 Erin Gordon

  Point Blank Range;          Is the range due to the jump of the gun

  
  

  Drift;          The constant deflection of the projectile from the plane

                      of departure due to the rotation imparted by the rifling
  

  
  

  Note

                      Drift is only compensated for in guns by placing the
  

                      tangent sight in teh gun at a permanent angle of set
  

                      but in the 18 Pcr 6 F the right trunnion of the bradle 
  

                      is a 1 1/2 degrees higher than the left
  

  
  

  Battery Angle;          The angle formed at the Battery by imaginary

                                       lines drawn to the target and the Observing Station
  

  
  

  Muzzle Velocity          The velocity in feet per second with which a

                                          projectile leaves the muzzle
  

  
  

  Maintaining Velocity;          The velocity of the projectile at any given

                                                  point of its trajectory
  

  
  

  Striking Velocity          The velocity of the projectile at the point

                                          of impact
  

  
  

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