Building Construction
Single Flemish bond consists of

English bond facing and double Flemish bond backing in each course
Stretcher bond facing and double Flemish bond backing in each course
Double Flemish bond facing and header bond backing in each course
Double Flemish bond facing and English bond backing in each course

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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
All listed here
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

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