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Keystone View Company. The Keystone View Company was a major distributor of stereographic images, and was located in Meadville, Pennsylvania. From 1892 through 1963 Keystone produced and distributed both educational and comic/sentimental stereoviews, and stereoscopes. By 1905 it was the world's largest stereographic company.
Keystone (architecture) 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 bear weight. [1] [2] [3] In arches and vaults (such as ...
The Keystone Pipeline System is an oil pipeline system in Canada and the United States, commissioned in 2010 and owned by TC Energy and, as of March 2020, ...
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Keystone Shipping Company is part of the Ready Reserve Fleet program. Keystone Shipping Company was founded by Charles Kurz. Before Keystone Shipping Company, Charles Kurz was a shipping agent, commodities trader, and ship owner. Keystone Shipping Company headquarters is in Bala Cynwyd, Pennsylvania.
A keystone species is a species that has a disproportionately large effect on its natural environment relative to its abundance. The concept was introduced in 1969 by the zoologist Robert T. Paine. Keystone species play a critical role in maintaining the structure of an ecological community, affecting many other organisms in an ecosystem and ...
Keystone effect. Comparison between an image which hasn't been keystone-corrected (top), and one which has been keystone-corrected (bottom). The keystone effect is the apparent distortion of an image caused by projecting it onto an angled surface. It is the distortion of the image dimensions, such as making a square look like a trapezoid, the ...
Keystone Studios was an early film studio founded in Edendale, California (which is now a part of Echo Park) on July 4, 1912 as the Keystone Pictures Studio by Mack Sennett with backing from actor-writer Adam Kessel (1866–1946) and Charles O. Baumann (1874–1931), owners of the New York Motion Picture Company (founded 1909).