Plane Table surveying accessories
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Survey Equipment
Plain Alidade in Surveying price in Bangladesh
It consists of two foldable vanes which are bevelled and graduated. Two sight vanes are mounted at two edges. One with narrow slit sight serves as eye vane, and the other wide slit attached with thin wire serves as object vane. Using both vanes, we plot the line of sight on board.
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Survey Equipment
Trough Compass For Plane Table Surveying
Trough Compass
Size : stander
origin : India
The trough compass is  used for marking the magnetic north line on the drawing sheet of the plane table. In this case, the magnetic needle point to 0° – 0° of the graduated scale and a line drawn parallel to the edge of the trough compass is along the magnetic meridian.
This trough compass is placed on the plane table to help in aligning the table accurately with north-south and east-west directions. Surveyors use it to sight distant objects with known azimuths, aiding in orienting the plane table precisely.
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