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A trapdoor or hatch is a sliding or hinged door that is flush with the surface of a floor, ceiling, or roof. [1] It is traditionally small in size. [2] It was invented to facilitate the hoisting of grain up through mills, however, its list of uses has grown over time. [3]
A trapdoor is a door set into a floor or ceiling. Trapdoor or Trap Door may also refer to: Trap Door, a science fiction fanzine; The Trap Door, a British animated TV series The Trap Door, a computer game based on the animated series; Trapdoor (software), a piece of computer software used for network administration
"Build a better mousetrap, and the world will beat a path to your door" is a metaphor about the power of innovation. It originated, in a somewhat different form, with Ralph Waldo Emerson . [ 1 ] [ 2 ] The epigram as known today, which specifies "mousetrap", probably also originated with Emerson, although the evidence for this is indirect.
For instance, for proper security a sidelight should only be installed on the side of the door without the door knob or handle. [7] Sidelights provide people on a building's interior with a narrow view of the outdoors and as such doors without sidelights, especially in apartment buildings , should be equipped with a peephole .
An intercom and/or video camera are often used to allow the guard to control the trap from a remote location. In an automatic mantrap, identification may be required for each door, sometimes even different measures for each door. For example, a key may open the first door, but a personal identification number entered on a number pad opens the ...
A sewer pipe is normally at neutral air pressure compared to the surrounding atmosphere.When a column of waste water flows through a pipe, it compresses air ahead of it in the system, creating a positive pressure that must be released so it does not push back on the waste stream and downstream traps, slow drainage, and induce potential clogs.
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