John Breed, Diary and Training diary, item 145

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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

Transcription saved

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


Transcription history
  • 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


  • 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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    ID
    17035 / 198384
    Source
    http://europeana1914-1918.eu/...
    Contributor
    Mrs Jean Hanby
    License
    http://creativecommons.org/licenses/by-sa/3.0/


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