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Q: Wooden open cross staff block of size ______ square.
  • A. 150 mm
  • B. 160 mm
  • C. 155 mm
  • D. 165 mm
Correct Answer: Option A - Open cross staff–It is the simplest type of cross staff, which is commonly used for set out right angle. • The head is wooden block octagonal or round, about 15 cm side or 20 cm diameter and 4 cm deep. • Wooden open cross staff block of size is 150 mm square.
A. Open cross staff–It is the simplest type of cross staff, which is commonly used for set out right angle. • The head is wooden block octagonal or round, about 15 cm side or 20 cm diameter and 4 cm deep. • Wooden open cross staff block of size is 150 mm square.

Explanations:

Open cross staff–It is the simplest type of cross staff, which is commonly used for set out right angle. • The head is wooden block octagonal or round, about 15 cm side or 20 cm diameter and 4 cm deep. • Wooden open cross staff block of size is 150 mm square.