surveying - right angle measurements, Cross staff, Prism square, Site square, optical square

In chain surveying for the right angle measurements different types of instruments used like cross staff, optical square, prism square and site square. With the procedure of measuring right angle also explain these instruments. This lecture improve your knowledge and command on the surveying subject.
#CivilEngineering #survey #prismsquare
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[@engineerrohit]

Thank you ☺️

[@ShreeDeviClasses]

You’re welcome 😊

[@krunalsolanki3080]

45°, mirror place in optical square

[@ShreeDeviClasses]

yes

[@krunalsolanki3080]

Ma'am optical square measure only 90° angle..

[@ShreeDeviClasses]

No. it can measure both 90 and 45 degree