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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 ...
The keystone concept is defined by its ecological effects, and these in turn make it important for conservation. In this it overlaps with several other species conservation concepts such as flagship species, indicator species, and umbrella species. For example, the jaguar is a charismatic big cat which meets all of these definitions: [11]
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.
A cultural keystone species is one which is of exceptional significance to a particular culture or a people. Such species can be identified by their prevalence in language, cultural practices (e.g. ceremonies), traditions, diet, medicines, material items, and histories of a community.
However, lintels are subject to bending stress, while the flat arches are true arches, composed of irregular voussoir shapes (the keystone is the only one of the symmetric wedge shape), [86] and that efficiently uses the compressive strength of the masonry in the same manner as a curved arch and thus requires a mass of masonry on both sides to ...
1. Get to Know Yourself. The first step is clarifying your values. “My biggest piece of advice is to relearn yourself,” Hordge says. “Once you understand who you are, you’ll know what’s ...
Ethel's grandchildren were born into a rich history from her 11 children. Kathleen and her husband, David Townsend, had four daughters: Meaghan Anne Kennedy Townsend, born Nov. 7, 1977; Maeve ...
Understand why athletes use them to get a leg up. ... Other peptides affect one's endocrine system, which plays an important role in cell and organ growth and development, ...