He used an analogy with how water falls in a water wheel. Power from water was generated through the use of a water wheel. In the 1840s a saw mill powered by a water wheel started. This is the oldest type of vertical water wheel. It may be compared to the water wheel. Fludd's machine worked by recirculation by means of a water wheel and Archimedean screw. Each battery was driven by a cam shaft which was turned by a water wheel. The type of water wheel selected was dependent upon the location. New tools, like the Water Wheel, greatly enhanced productivity. This type of water wheel is the oldest type of horizontal axis wheel. It is similar to the undershot water wheel mentioned later in this article. A 1780s scribbling mill would be driven by a water wheel. As with a water wheel, the water is admitted at the turbine's edge. Historically, trip hammers were often powered hydraulically by a water wheel. About 1890, a turbine was installed to replace the water wheel.