Many of the old millers were artisans of the highest skill, full brothers to the builders of the covered bridges, whose craftsmanship perished with them. One of them was Oliver Evans, a noted millwright who lived in Pennsylvania in the late 1700’s. He introduced various innovations. One of them was a tiny elevator with metal cups to carry ground grain from the stones to the bins for storage. Before the advent of these elevators the newly ground meal was ladled out of the pile beneath the millstones with great wooden shovels. [Illustration: This interior view of the Old Mill in Carillon Park shows the mechanism by which power was transmitted from the water wheel to the grinding stone.] The grist mills were usually run by water wheels. These were made up of two immense wheels on the same shaft with spokes of heavy flat boards mortised to fit close together at the hub and joined together at the rim by paddles, floats, or palettes of heavy wood which made an endless, revolving stairway. Some wheels had compartments on each float, the better to catch the water. The overshot wheel required a dam and was turned by the weight of the water which fell on it from above. The wheel was located wherever the dam or flume was placed. Usually it was exposed to the weather but sometimes it rested under a shed or penthouse. The wheel pit was a danger hole. If a man fell into it while the wheel was turning he had little chance of escape. Millers were known to have been drowned in their own mills when someone opened the water gate at the wrong time. There were two kinds of mills—the water wheel construction and the tub mill. A tub mill was the simplest and cheapest of all types of grist mill. In it the wheel was located down in a pit or “tub” and lay horizontally with a vertical axle, whereas the water wheel type was a wheel rotating on a vertical plane and mounted on a horizontal axis. One of the first mills hereabouts was a tub mill built by Daniel C. Cooper where The National Cash Register Company lumber yard now stands. The millstones were fashioned out of material usually common to the locality in which they were used. New Hampshire granite was widely employed and what was called burrstone, originally imported from France, and later discovered in Arkansas, also came into use. A sandstone found in New York State found its way to many mills. Before roads were opened up to the West and South, millstones for the new settlements were broken up, carried on pack horses to their destination, and then assembled with iron bands to hold them together.