10) Plain table survey
Aim:-to understand map and it surface area.
Requirement :- tripod ,razing drawing proper,pencil,scale,pin,meter tape, usacle,plumb,tube
Compass , steel scale, allidate scale.
Procedure :- to remove a map of a place and went   to the middle point of the place and set
Up  the  tripod and fixed the plain table on the tripod .then placed a proper on the plain table
then  piched a pin at the center of proper and the four side of paper .then placed  a illidate
Scale on the paper , and a razing rod then mark the point where razing rod can be seen
Through allidate scale .then marked the line on the paper .do some to all four side of the
area .then by surface area formula find the surface  of the area .
Observation :- point on the paper should marked properly.
                         1cm sq = 3m sq
               Total area = 746 sq
            :. 746 X 9 = 6714 m
              6714  = 67.14 gunthe