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Fly-wheels, their purpose, calculation and design, by C.H. Benjamin and W. Burlingham.--Fly-wheel tests.--Safe speed for fly-wheels.--Size, weight and capacity of fly-wheels for punches, by F.B. Kleinhans.--Simplified methods for fly-wheel calculations, by R.J. Williams.--Fly-wheels for motor-driven planers, by W. Owen