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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]
"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.
A revolving door typically consists of three or four doors that hang on a central shaft and rotate around a vertical axis within a cylindrical enclosure. To use a revolving door, a person enters the enclosure between two of the doors and then moves continuously to the desired exit while keeping pace with the doors.
An ornate brass door hinge A barrel hinge. A hinge is a mechanical bearing that connects two solid objects, typically allowing only a limited angle of rotation between them. Two objects connected by an ideal hinge rotate relative to each other about a fixed axis of rotation, with all other translations or rotations prevented; thus a hinge has one degree of freedom.
Architects have made use of both reclaimed historical shutter hardware as well as used stainless sailing hardware for new projects. Other uses are closet doors, barn doors, storm doors, etc. All uses require hold backs of some sort to keep shutter or door from "flapping in the wind".
The Springfield Model 1873 was the first standard-issue breech-loading rifle adopted by the United States Army (although the Springfield Model 1866 had seen limited issue to troops along the Bozeman Trail in 1867).
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