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The keystone is the centre stone or masonry unit at the apex of an arch. The springer is the lowest voussoir on each side, located where the curve of the arch springs from the vertical support or abutment of the wall or pier. [1] The keystone is often decorated or enlarged.
The keystone (shown in red) of an arch Dropped keystone at Colditz Castle. A keystone (or capstone) is the wedge-shaped stone at the apex of a masonry arch or typically round-shaped one at the apex of a vault. In both cases it is the final piece placed during construction and locks all the stones into position, allowing the arch or vault to ...
Keystone species, species that have a larger effect on their environment than is purely due to their abundance; Operation Keystone, during World War II; Keystone, a variety of screwdriver blade "Keystone", a descriptive reference to the Book of Mormon; The Keystone, journal of the Pennsylvania Railroad Technical and Historical Society
Keystone symbols displayed at a military parade in 1899 (the symbols are described as being white, on a blue field, with red letters). In September 1899, a military parade in Philadelphia featured a choir of 3,200 school-children and teachers that were arranged to display three keystone symbols with the letters "GAR" on them (standing for Grand army of the Republic).
Dealey Plaza was built on land donated by early Dallas philanthropist and businesswoman Sarah Horton Cockrell. It was the location of the first home built in Dallas, which also became the first courthouse and post office, the first store, and the first fraternal lodge. It is sometimes called the "birthplace of Dallas". [15]
Signet ring with engraved bezel Ring with an engraved gem in a bezel setting. A bezel is a wider and usually thicker section of the hoop of a ring, which may contain a gem or a flat surface (usually with an engraved design, as in a signet ring). [1] Rings are normally worn to display bezels on the upper or outer side of the finger.
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A bezel set sapphire. The earliest known technique of attaching stones to jewelry was bezel setting. A bezel is a strip of metal bent into the shape and size of the stone and then soldered to the piece of jewelry. The stone is then inserted into the bezel, and the metal edge of the bezel pressed over the edge of the stone, holding it in place.