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

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

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Building Construction
Mansard roof is a roof which slopes in

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

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