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Lightening holes have been used on various architecture designs. [10] During the 1980s and early 1990s, lightening holes were fashionable and somewhat seen as futuristic and were used in the likes of industrial units, car showrooms, shopping precincts, sports centres etc. Parsons House in London is a notable building that uses lightening holes ...
A cutting-pattern, often called just pattern, is an arrangement of small rectangles on the stock sheet. It may be given as a sequence of points (x i,y i), for i in 1,...,m, where (x i,y i) is the bottom-left coordinate of rectangle i. In such a pattern, rectangle i occupies a horizontal segment (x i, x i +w i) and a vertical segment (y i, y i ...
The zax (also called a sack or sax [6]) is a hand tool for cutting, trimming, and punching nail holes in slate. It consists of a heavy rectangular knife blade with a large point, of square cross section, protruding from the poll (or butt). The blade edge is used to split slate, while the point is used to pierce square holes for mounting the ...
Guillotine partition is the process of partitioning a rectilinear polygon, possibly containing some holes, into rectangles, using only guillotine-cuts. A guillotine-cut (also called an edge-to-edge cut ) is a straight bisecting line going from one edge of an existing polygon to the opposite edge, similarly to a paper guillotine .
the mortise hole, and; the tenon tongue. The tenon, formed on the end of a member generally referred to as a rail, fits into a square or rectangular hole cut into the other, corresponding member. The tenon is cut to fit the mortise hole exactly. It usually has shoulders that seat when the joint fully enters the mortise hole.
The process of perforating metal sheets has been practiced for over 150 years. In the late 19th century, metal screens were used as an efficient means of separating coal. The first perforators were laborers who would manually punch individual holes into the metal sheet. This proved to be an inefficient and inconsistent method which led to the ...