"The Scotch-type turbine on the pit's floor of the corn mill is a unique piece of hydraulic technology machinery, recognized by the American Society of Mechanical Engineers. Although the turbine is not a classic 17th-century Baker's centrifugal or reaction turbine wheel it might be a transformed one, since this "Buena Vista Turbine" does not fit within the Baker's description. Nevertheless, the wheels have an element in common since their arms are very similar in so far as it refers to shape, position, and function. On the other hand, it is not a Scotch turbine either, being this a modification of the Baker turbine. Apparently, the Buena Vista turbine builder used the Scotch turbine principles to make the one "in situ", adapting at the same time parts of the Baker's design with added improvements of its own. It is significant that in the mid-1840s—while the hacienda was being developed—the Scotch turbine was being patented in the United States after European designs (particularly the La Cour's centrifugal wheel). R. L. Johnson assessed the "Buena Vista Turbine" in the following way: