A combination square is a tool used for multiple purposes in woodworking, stonemasonry and metalworking. It is composed of a ruled blade and one or more interchangeable heads that may be affixed to it. The most common head is the standard or square head which is used to lay out or check right and 45° angles. ==Uses== In woodworking, the starting ...
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http://en.wikipedia.org/wiki/Combination_square
A type of square commonly used for layout work. The combination square has a 12-inch blade that moves through a head. The head is marked with 45-degree and 90-degree angle measures. Some squares also contain a small spirit level and a carbide scriber, which is a sharp, pointed tool for marking metal...
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http://www.daviddarling.info/encyclopedia/C/AE_combination_square.html
A drafting and layout tool combining a square,level, protractor and a center head.
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https://steelforge.com/literature/steelog-the-5000-word-metals-glossary/
A drafting and layout tool combining a square, level, protractor, and centre head. See also: Micrometer.
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https://www.encyclo.co.uk/local/20687
an adjustable device for carpenters, used as a try square, miter square, level, etc.
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https://www.infoplease.com/dictionary/combination-square
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