John Breed, Diary and Training diary, item 145

• April 3, 2017 01:44:50 Cheryl Ellsworth

  Wind Corrections

      Many theoretical formulae have been

  calculated, which are supposed the exact allowance for a

  wind of gun strength

  A rough estimate of the deflection per thousand yards

  in the range necessary to allow for a wind blowing directly

  across the line of fire is as follows

   
  

  15 minutes when the wind is Very Strong
  

  10      "                   "               "  "Strong" 
  

  7        "                   "               "  "Fresh"
  

  5        "                   "               "   "Moderate"
  

  In the case of howitzers these amounts should be slightly

  increased in practice the above figures are only useful

  as a very rough first approximations, for the force of the

  air cannot be determined, neither the direction of the wind

  in the upper regions, with any approach to certainty from the

  conditions prevailing at the ground surface. Fortunately for

  the gunners the higher winds are much less variable than the

  surface winds, and a correction based on the actual fall

  of the shell usually gives good results

• April 2, 2017 18:09:46 Cheryl Ellsworth

  Wind Corrections

      Many theoretical formulae have been

  calculated, which are supposed the exact allowance for a

  wind of gun strength

  A rough estimate of the deflection per thousand yards

  in the range necessary to allow for a wind blowing directly

  across the line of fire is as follows

   
  

  15 minutes when the wind is Very Strong
  

  10      "                   "               "  "Strong" 
  

  7        "                   "               "  "Fresh"
  

  5        "                   "               "   "Moderate"
  

  In the case of howitzers these amounts should be slightly

  increased in practice the above figures are only useful

  as a very rough first approximations, for the force of the

  air cannot be determined, neither the direction of the wind

  
  

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• April 2, 2017 18:04:55 Cheryl Ellsworth

  Wind Corrections

      Many theoretical formulae have been

  calculated, which are supposed the exact allowance for a

  wind of gun strength

  A rough estimate of the deflection per thousand yards

  in the range necessary to allow for a wind blowing directly

  across the line of fire is as follows

  
  

  
  

  
  

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