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Sometimes they have interior sliding doors. Doors on rollers are believed to have been a development from rail cars which had sliding doors. [3] A full basement became standard and was used primarily for manure management with trap doors in the floor of the tie-up so manure was easily shoveled into the basement for later use on the fields.
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 ]
Basement floor drains that connect to sanitary sewers need to be filled regularly to prevent the trap from drying out and sewer gas from escaping into the basement. The drain trap can be topped up automatically by the condensation from air conditioners or high-efficiency furnaces. A small tube from another downpipe is sometimes used to keep the ...
Millisent Dexter c. 1870 Basement plan: note trap door callout on left. Dexter chose a site on a prominent hilltop to build his country estate. [8] He hired architect Calvin T. Fillmore (brother of Millard Fillmore) to design his new country house. [4] Fillmore had moved to Washtenaw County in 1837, and had a successful career as an architect ...
The usual design is a trap-door, to minimize the size and expense. In dual-purpose shelters, which have a secondary peacetime use, the door may be normal. To reduce the weight, the door is normally constructed of steel, with a fitted steel lintel and frame welded to the steel-reinforcement of the concrete.
The limited internal dimensions indicate that this tower is not intended to be inhabited for long periods. Its function is as a watchtower and visible expression of judicial power. The entrance to the tower is 8m above ground in order to impede access in case of war. From the windowless basement a wooden trap door descends into the dungeon.