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Laroy S. Starrett invented the combination square in 1877.

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the primary components are a removable flat metal ruler with a groove running down the center and a square head, comprising a shoulder at 45 degrees and an anvil at 90 degrees, which you can adjust to slide down the ruler and lock at the right measurement. the accessories are a spirit level, which is used to confirm that a surface is flat, and some come with a scriber to mark measurements.

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People measure material for accuracy, mark lines, and angles with a combination square.

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I chose this video because it has everything you could need to know about a combination square and it shows examples of it in use.

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Some ways you can use a combination square are checking for square angles, measure and mark 45 degree angles, determine the center of round objects, use as a level, use as a ruler, and check to insure flat surfaces. Becoming proficient with a combination square can help you with all of these uses, and insure accuracy with them.