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Trapdoor

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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. It is traditionally small in size. It was invented to facilitate the hoisting of grain up through mills, however, its list of uses has grown over time. The trapdoor has played a pivotal function in the operation of the gallows, cargo ships, trains, booby traps, and more recently theatre and films.

GallowsGallowsA gallows (or less precisely scaffold) is a frame or elevated beam, typically wooden, from which objects can be suspended or "weighed". Gallows were thus widely used to suspend public weighing scales for large and heavy objects such as sacks of grain or minerals, usually positioned in markets or toll gates.Cargo shipCargo shipA cargo ship or freighter is a merchant ship designed to transport goods, commodities, and materials across seas and oceans to help others, or to ship to stores. These ships form the backbone of international trade, carrying the majority of global freight by volume.Economy coffinEconomy coffinThe economy coffin, hinged coffin or Josephinian coffin (German: Sparsarg, Klappsärge, or Josephinischer Sarg) was a type of reusable coffin introduced by Joseph II, Holy Roman Emperor in the late 18th century. The body was carried in the coffin to the gravesite where it would be dropped into the grave through folding doors on the base. The coffin would then be reused.ShipShipA ship is a large watercraft designed for travel across the surface of a body of water, carrying cargo or passengers, or in support of specialized tasks such as warfare, oceanography and fishing. Ships are generally distinguished from boats, based on size, shape, load capacity and purpose. Ships have supported exploration, trade, warfare, migration, colonization, and science. Ship transport is responsible for the largest portion of world commerce.RoofRoofA roof (pl.: roofs or (rarely) rooves) is the top covering of a building, including all materials and constructions necessary to support it on the walls of the building or on uprights, providing protection against rain, snow, sunlight, extremes of temperature, and wind. A roof is part of the building envelope.Bulk carrierBulk carrierA bulk carrier or bulker is a merchant ship specially designed to transport unpackaged bulk cargo, typically grain, coal, ore, forest products, steel coils, or cement, in its cargo holds. Since the first specialized bulk carrier was built in 1852, economic forces have led to increased size and sophistication of these ships. Today's bulk carriers are specially designed to maximize capacity, safety, efficiency, and durability.Deck (ship)Deck (ship)A deck is a permanent covering over a compartment or a hull of a ship. On a boat or ship, the primary or upper deck is the horizontal structure that forms the "roof" of the hull, strengthening it and serving as the primary working surface.Railway platform heightRailway platform heightRailway platform height is the built height – above top of rail (ATR) – of passenger platforms at stations. A connected term is train floor height, which refers to the ATR height of the floor of rail vehicles. Worldwide, there are many, frequently incompatible, standards for platform heights and train floor heights.Joseph II, Holy Roman EmperorJoseph II, Holy Roman EmperorHoly Roman Emperor from 1765 to 1790HouseHabsburg-LorraineFatherFrancis I, Holy Roman EmperorMotherMaria TheresaSignatureJoseph II (13 March 1741 – 20 February 1790) was Holy Roman Emperor from 18 August 1765 and sole ruler of the Habsburg monarchy from 29 November 1780 until his death.Booby trapBooby trapA booby trap is a device or setup that is intended to kill, harm or surprise another human being or an animal. It is triggered by the presence or actions of the victim and sometimes has some form of bait designed to lure the victim towards it. The trap may be set to act upon trespassers that enter restricted areas, and it can be triggered when the victim performs an action (e.g., opening a door, picking something up, or switching something on).TrainTrainA train (from Old Frenchtrahiner, from Latintrahere, "to pull, to draw") is a series of connected vehicles that run along a railway track and transport people or freight. Trains are typically pulled or pushed by locomotives (often known simply as "engines"), though some are self-propelled, such as multiple units or railcars. Passengers and cargo are carried in railroad cars, also known as wagons or carriages. Trains are designed to a certain gauge, or distance between rails.

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