 Wind engines had the inherent design fault that they would only work when the wind blew, and could therefore be unusable when they were most needed.The Commissioners therefore turned their attention to mechanising the pumping mills, and employed Mr. W. C. Mylne to advise them on the relative benefits of steam and gas engines in 1829.His report recommended the use of steam engines, and so a engine was ordered from Boulton Watt and Co., which would drive two scoop wheels.