Building Construction
The type of ashlar masonry in which stones are finely chisel dressed and thickness of joints does not exceed 3 mm, is

Chamfered ashlar masonry
Random coursed ashlar masonry
Coursed ashlar masonry
Ashlar facing masonry

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Building Construction
Rotary drilling

Is not suitable for deposits containing very coarse gravel
All listed here
Is not economical for holes of less than 10 cm
Hinders the ground water observations and permeability test

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