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  2. Murder hole - Wikipedia

    en.wikipedia.org/wiki/Murder_hole

    Murder holes at Bodiam Castle. A murder hole or meurtrière is a hole in the ceiling of a gateway or passageway in a fortification through which the defenders could shoot, throw or pour harmful substances or objects such as rocks, arrows, scalding water, hot sand, quicklime, or boiling oil, down on attackers. Boiling oil was rarely used because ...

  3. Piping and plumbing fitting - Wikipedia

    en.wikipedia.org/wiki/Piping_and_plumbing_fitting

    A threaded pipe has a screw thread at one or both ends for assembly. Steel pipe is often joined with threaded connections; tapered threads are cut into the end of the pipe, and sealant is applied in the form of thread-sealing compound or thread seal tape (also known as PTFE or Teflon tape) and the pipe is screwed into a threaded fitting with a ...

  4. Plumber's snake - Wikipedia

    en.wikipedia.org/wiki/Plumber's_snake

    A man clears a sanitary sewer pipe with a motorized snake. Plant roots and other material being removed from a drain. A plumber's snake or drain snake or drain auger is a slender, flexible auger used to dislodge clogs in plumbing. The plumber's snake is often reserved for difficult clogs that cannot be loosened with a plunger.

  5. Weld access hole - Wikipedia

    en.wikipedia.org/wiki/Weld_access_hole

    The weld access hole or rat hole is a structural engineering technique in which a part of the web of an I-beam or T-beam is cut out at the end or ends of the beam. The hole in the web allows a welder to weld the flange to another part of the structure with a continuous weld the full width on both top and bottom sides of the flange. Without the ...

  6. Weep (architecture) - Wikipedia

    en.wikipedia.org/wiki/Weep_(architecture)

    Weep hole. A weep, a weep hole, or a weep-brick is a small opening that allows water to drain from within an assembly. Weeps are located at the bottom of the object to allow for drainage; the weep hole must be sized adequately to overcome surface tension.

  7. Holy Ghost hole - Wikipedia

    en.wikipedia.org/wiki/Holy_Ghost_hole

    A Holy Ghost hole in the center of a fresco with a latticework covering and a dove figure, Parish church of Wiesing. A Holy Ghost hole, or Holy Spirit hole, is a circular opening in the ceiling of a church which symbolises the descent of the Holy Spirit on the day of Pentecost. The openings are often used for liturgical performances.

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