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“A plate of glass about 2.5 inches square is ruled with twenty-one lines in one direction .1 inch apart, and two lines in the other direction 2 inches apart. The extreme lines of the set therefore form a perfect square of 2 inches. These lines are ruled with exceeding accuracy and care, but provision is left for ascertaining any errors that remain either as to distance or want of perfect squareness.” —The Encyclopedia Britannica, 1903


The Encyclopedia Britannica, New Warner Edition (New York, NY: The Werner Company, 1893)


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