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Ideal for solving virtually every geometric and layout problem, this guide to the steel square blends practical advice with skill-building exercises designed to help readers get the most out of this amazing tool. Unlocking the secrets of this versatile device, professional advice covers a wide range of topics—including making measurements as fine as one-hundredth of an inch, finding the center of a circle, and building stairs—making this guide a must-have reference for woodworkers, carpenters, tool collectors, and anyone interested in the history of tools.