Building Construction
Slate

Splits into thin sheets along its bedding planes
Possesses good water absorption capacity
Has a smooth surface and contains alumina and silica
Is a metamorphic rock

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Building Construction
Rotary drilling

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

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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
A flap valve at the bottom of tube is provided to extract the soil sample
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The tube is raised and lowered by 4 thick rope moving over a pulley suspended on a tripod stand

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