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This hinge pivots in openings in the floor and the top of the door frame. Also referred to as double-acting floor hinges, they are found in ancient dry stone buildings and, rarely, in old wooden buildings. They are a low-cost alternative for use with lightweight doors. [3] Doors with these hinges may be called haar-hung doors.
Nahal Hever Canyon, Israel Museum, Jerusalem. The three-age system is the periodization of human prehistory (with some overlap into the historical periods in a few regions) into three time-periods: the Stone Age, the Bronze Age, and the Iron Age, [1][2] although the concept may also refer to other tripartite divisions of historic time periods.
Tin bronze technology requires systematic techniques: tin must be mined (mainly as the tin ore cassiterite) and smelted separately, then added to hot copper to make bronze alloy. The Bronze Age was a time of extensive use of metals and the development of trade networks.
Crash bar. A crash bar (also known as a panic exit device, panic bar, or bump bar) [1][2] is a type of door opening mechanism which allows users to open a door by pushing a bar. While originally conceived as a way to prevent crowd crushing in an emergency, crash bars are now used as the primary door opening mechanism in many commercial buildings.
The Detroit People Mover (DPM) is a 2.94-mile (4.73 km) elevated automated people mover system in Detroit, Michigan, United States. [3] The system operates in a one-way loop on a single track encircling downtown Detroit, using Intermediate Capacity Transit System linear induction motor technology developed by the Urban Transportation Development Corporation.
Ashlar (/ ˈæʃlər /) is a cut and dressed stone, worked using a chisel to achieve a specific form, typically rectangular in shape. The term can also refer to a structure built from such stones. [1] Ashlar is the finest stone masonry unit, and is generally rectangular (cuboid). It was described by Vitruvius as opus isodomum or trapezoidal.
Bronze is the most popular metal for cast metal sculptures; a cast bronze sculpture is often called simply "a bronze". It can be used for statues, singly or in groups, reliefs, and small statuettes and figurines, as well as bronze elements to be fitted to other objects such as furniture.
Long Meg and Her Daughters is a Neolithic stone circle situated north-east of Penrith near Little Salkeld in Cumbria, North West England. One of around 1,300 stone circles in the British Isles and Brittany, it was constructed as a part of a megalithic tradition that emerged during Neolithic, and continued into the Early Bronze Age (circa 3200 ...