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  2. Notching - Wikipedia

    en.wikipedia.org/wiki/Notching

    End notching works the end of the tube, such as a semicircular concavity to make the base of a tee, or a convex vee to fit into a mitre. Vee-notched tube, bent for assembly of a mitred joint. Side notching (also called offset notching) works the side of a tube with a vee notch for bending, semicircular or vee notches for tee joint.

  3. Downtown Hudson Tubes - Wikipedia

    en.wikipedia.org/wiki/Downtown_Hudson_Tubes

    The Downtown Hudson Tubes use a roughly east-southeast to west-northwest path under the Hudson River, connecting Manhattan in the east with Jersey City in the west. Each track is located in its own tube, [1] which enables better ventilation by the so-called piston effect.

  4. Horse Lava Tube System - Wikipedia

    en.wikipedia.org/wiki/Horse_Lava_Tube_System

    The Horse Lava Tube System (or Horse system) is a series of lava tubes within Deschutes County, Oregon, of the United States. The system starts within the Deschutes National Forest on the northern flank of Newberry Volcano and heads north into and near the city of Bend. [1] [2] The system continues north to Redmond and includes the Redmond Caves.

  5. Lava tube - Wikipedia

    en.wikipedia.org/wiki/Lava_tube

    A lava tube, or pyroduct, [1] is a natural conduit formed by flowing lava from a volcanic vent that moves beneath the hardened surface of a lava flow. If lava in the tube empties, it will leave a cave .

  6. Arnold Lava Tube System - Wikipedia

    en.wikipedia.org/wiki/Arnold_Lava_Tube_System

    The Arnold Lava Tube System (or Arnold system) is series of lava tubes in Deschutes County, Oregon, in the United States. It is located several miles southeast of the city of Bend . The system starts in the Deschutes National Forest on the northern flank of Newberry Volcano , heads northeast onto BLM land before finally terminating on private ...

  7. Lincoln Tunnel - Wikipedia

    en.wikipedia.org/wiki/Lincoln_Tunnel

    The longest tube is the 8,216-foot (2,504 m) center tube, [9] which runs parallel to the 8,006-foot (2,440 m) southern tube. [ 10 ] [ 2 ] The northern tube is 7,482 feet (2,281 m) long. [ 2 ] On the Manhattan side, there is an Art Deco ventilation shaft located west of 12th Avenue.

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