Auto level

Tilting level

Dumpy level

Wye (y) level

Errors of manipulation

Errors of sighting

Errors of instrumental

Errors of plotting

Checks the straight edge in all directions

Set up and level the plane table over a station

If the bubble is not central position, the error by keeping packing between the underside of the board

Correct the edge by filling and again test

Burnt sienna

Burnt timber

Crimson Lake

Prussian blue

Technique of tracing

Method of reproduction

Sequence of tracing

Should be traced in tracing cloth