3. Explain the procedure to measure the right angle of wall with optical square or open
cross staff, or Thedolite /Total station
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(i) Open cross- staff and
(ii) French cross-staff, the first one being in common use.
(i) Open Cross-Staff:
The simplest form of cross-staff is the open wooden cross-staff shown in fig. 3.7. It consists of a round or square piece of wood about 4 cm thick and varying form 15 cm to 30 cm in diameter or side mounted on an iron shod wooden staff about 2.5 cm diameter and 1.5 m long. The disc is provided with two saw cuts about 1 cm deep at right angles to each other, giving two lines of sight
Explanation:
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