Building Construction
In the method of tube boring of soil investigation, the following is essential:

A tube of about 2 meters length and 20 cm diameter with a cutting edge
The tube is raised and lowered by 4 thick rope moving over a pulley suspended on a tripod stand
All listed here
A flap valve at the bottom of tube is provided to extract the soil sample

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Building Construction
Mansard roof is a roof which slopes in

Two directions without break in the slope on each side
Two directions with break in the slope on each side
Four directions with break in the slope on each side
Four directions without break in the slope on each side

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Building Construction
Rotary drilling

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

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