ew York Rapid Transit Tunnel. This ~ portion There has recently appeared in the daily press a driven forward through the wall of the shaft into the of the Blackwall Tunnel consists of four layers of surrounding material: description of a so-called ball-bearing rifled gun, which brickwork, built in… … government testing ground at tunnel. Two circular openings were Sandy Hook, and to examine into formed on opposite sides of each the claims of the inventor. -The latter. believes that layer of London.clay between the tunnel and the river shaft on the center line of the tunnel, and these open- ings…
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