An Experimental Enquiry Concerning The Natural Powers Of Water And Wind To Turn Mills, And Other Machines, Depending On A Circular Motion is a book written by John Smeaton in 1760. The book is an investigation into the use of water and wind as sources of energy to power machines such as mills. Smeaton conducted a series of experiments to determine the natural powers of water and wind and their ability to generate a circular motion. He also examined...