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Polycarbonate is commonly used in eye protection, as well as in other projectile-resistant viewing and lighting applications that would normally indicate the use of glass, but require much higher impact-resistance. Polycarbonate lenses also protect the eye from UV light.
Kaynemaile is a chainmail fabric consisting of polycarbonate interlinked rings connected together by liquid-state assembly to form a flexible mesh sheet. It is made from polycarbonate and used in the architecture and design industry. [1] [2] It was invented by Kayne Horsham in 2004. [3]
Kevlar (para-aramid) [2] is a strong, heat-resistant synthetic fiber, related to other aramids such as Nomex and Technora.Developed by Stephanie Kwolek at DuPont in 1965, [3] [2] [4] the high-strength material was first used commercially in the early 1970s as a replacement for steel in racing tires.
Brass knuckles carried by Abraham Lincoln's bodyguards during his train ride through Baltimore. Ford's Theatre National Historic Site, 2007 An Apache revolver, a weapon that combines brass knuckles with a firearm and a dagger – Curtius Museum, Liège, 2011 Mark I brass knuckles trench knife Homemade brass knuckles used in a lumber camp in Pine County, Minnesota.
The knuckles are the joints of the fingers. The word is cognate to similar words in other Germanic languages, such as the Dutch "knokkel" (knuckle) or German "Knöchel" (ankle), i.e., Knöchlein , the diminutive of the German word for bone ( Knochen ).
Owning, and carrying this brass knuckles, often has legal ramifications. However, "brass knuckles" have finger dividers; stirrup tekko do not. Although many kobudo practitioners claim that brass knuckles evolved from the tekko, brass knuckles more closely resembles the handle of the Western "trench knife".
The diagram from Beard's 1897 coupler patent [1]. Janney couplers were first patented in 1873 by Eli H. Janney (U.S. patent 138,405). [2] [3] Andrew Jackson Beard was amongst various inventors that made a multitude of improvements to the knuckle coupler; [1] Beard's patents were U.S. patent 594,059 granted 23 November 1897, which then sold for approximately $50,000, and U.S. patent 624,901 ...
It usually consists of a pair of plates, each with a set of open cylindrical rings (the knuckles) attached to them. The knuckles of the two plates are offset from each other and mesh together. A hinge pin is then placed through the two sets of knuckles and usually fixed, to combine the plates and make the hinge a single unit. [2]