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Completed in 1872, the Boyds Corner Dam saw the use of concrete in dam construction for the first time since the Ancient Romans. [ citation needed ] It was put into service in 1873, 78 feet (24 m) high, [ 2 ] making the Boyds Corner Reservoir the City's second oldest, after the New Croton Reservoir .
Shower door. Other common devices for containing water spray include a highly flexible, waterproof bathtub or shower curtain, or more recently, a shower door, which is a permanently installed sliding or pivoting door made from glass or plastic. Containing water spray, leaks, and splashes within the bathtub is particularly important in bathrooms ...
The ogee crest over-tops a dam, a side channel wraps around the topography of a dam, and a labyrinth uses a zig-zag design to increase the sill length for a thinner design and increased discharge. A drop inlet resembles an intake for a hydroelectric power plant and transfers water from behind the dam directly through tunnels to the river ...
Geosynthetic clay liners (GCLs) are factory manufactured hydraulic barriers consisting of a layer of bentonite or other very low-permeability material supported by geotextiles and/or geomembranes, mechanically held together by needling, stitching, or chemical adhesives. Due to environmental laws, any seepage from landfills must be collected and ...
A dental dam or rubber dam is a thin, 6-inch (150 mm) square sheet, usually latex or nitrile, used in dentistry to isolate the operative site (one or more teeth) from the rest of the mouth. Sometimes termed " Kofferdam " (from German ), it was designed in the United States in 1864 by Sanford Christie Barnum [ de ] . [ 1 ]
A chamfer with a "lark's tongue" finish. A chamfer (/ ˈ ʃ æ m f ər / SHAM-fər or / ˈ tʃ æ m f ər / CHAM-fər) is a transitional edge between two faces of an object.Sometimes defined as a form of bevel, it is often created at a 45° angle between two adjoining right-angled faces.
They are often used at the end of the threaded portion of a shaft or screw to provide clearance for the cutting tool, and also referred to as thread relief in this context. A rule of thumb is that the undercut should be at least 1.5 threads long and the diameter should be at least 0.015 in (0.38 mm) smaller than the minor diameter of the thread ...
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