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| | THE HOOSAC TUNNEL.Scribner'sDecember, 1870 |
 | | Most of the tunnels heretofore built are upon an ascending grade; and it is necessary that there should be some descent in order that the water, which is usually met with in large quantities, may be carried off. |
 | | For about seven hundred feet at this end the tunnel is, therefore, a complete tube of brick, seven courses in thickness; beyond that point, for fourteen hundred feet, the rock, though soft enough to require arching, is firm enough to sustain the walls of the arch, so that an invert is not needed. |
 | | The western portal of the tunnel is therefore, at present, at the bottom of a deep hole in the ground. |
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