Practical Tunnelling: Explaining in Detail the Setting Out of the Works; Shaft Sinking and Heading Driving; Ranging the Lines and Levelling Under ... of Tunnels; With the Amount of Labou - Tapa dura

Sinopsis

Excerpt from Practical Tunnelling: Explaining in Detail the Setting Out of the Works; Shaft Sinking and Heading Driving; Ranging the Lines and Levelling Under Ground; Sub-Excavating, Timbering, and the Construction of the Brickwork of Tunnels; With the Amount of Labour Required for and The

I had the pleasure of assisting him; and is represented in the following section.

London Clay Yellow clay thickness not determined. Blue or slate-coloured clay thickness 10 to 15 feet.

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