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Why Back Sight is also called as Plus Sight?

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Asked: October 5, 20202020-10-05T22:59:24+05:30 2020-10-05T22:59:24+05:30In: Construction Site Related
Komal Bhandakkar
Komal Bhandakkar

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Why Back Sight is also called as Plus Sight?

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  1. AdityaBhandakkar

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    AdityaBhandakkar User
    2020-10-16T12:45:47+05:30Added an answer on October 16, 2020 at 12:45 pm
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    Hi,

    Let make it simple and easy, When a staff reading is taken at the point of known elevation to determine the height of the instrument is called a backsight. This is the first reading taken when the level is set up at the given point. Just because of the reading is taken of known elevation to continue the further process of taking foresights, this is also called as plus sight. i.e existing plus one. and foresight is also known as a minus sight. because all the elevations are needed to be determined through a levelling process.

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  2. nikeetasharma

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    nikeetasharma Guru
    2020-10-06T17:44:19+05:30Added an answer on October 6, 2020 at 5:44 pm

    Generally, Back sight is the sight taken on a level staff held on the point of known elevation with an intense of determining the plane of collimation. It is always the first reading after the instrument is set in a place. Thus, it is also known as plus sight, since the reading is to be added to RL of the point (Benchmark or change point) to get plane of collimation.

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  3. Komal Bhandakkar

    Komal Bhandakkar

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    Komal Bhandakkar AUTHOR
    2020-10-05T23:32:31+05:30Added an answer on October 5, 2020 at 11:32 pm
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    Back Sight:

    Actually, the backside is a starting point for leveling. 

    The backside is the first reading after setting up the instrument at that particular site.

    Hence, backsight always is additive in nature.

    So, it’s also called plus sight.


    Thank You.

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  4. aviratdhodare

    aviratdhodare

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    aviratdhodare
    2020-10-08T17:37:53+05:30Added an answer on October 8, 2020 at 5:37 pm

    While calculating the Reduced Levels of various stations, first of all we will be finding out the height of collimation and deduct the IS or FS reading for getting the RL

    Now, HC is equal to RK of BM + BS

    Since BS is added always to get HC, it is called as plus sight

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  5. Komal Bhandakkar

    Komal Bhandakkar

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    Komal Bhandakkar AUTHOR
    2020-11-17T17:50:57+05:30Added an answer on November 17, 2020 at 5:50 pm
    This answer was edited.

    Back Sight: Backsight is simply a first reading which is taken after setting up the instrument. 


    Why the backsight is also called plus sight:

    Only because the reading is taken of known elevation to continue taking foresight reading. 


    Thank You.

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