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of the hoppers, when you wind up the clock you turn the key clockwise when alarm goes off, the key turn counterclockwise, he used a half inch dowell cut a groove in one end which fastened to the key and strung wound around dowell and fastened to trap doors, when the alarm went off the string would wind around the dowell and pull the trap doors open, the feed would flow through a three inch leader pipe to the feed bins, the horses were always fed on time, when this was in operation, the barn must have been almost 100 years old, it had heavy oak timber which was cut by hand, you could see the ax marks on the side, in the center was heavy frame work 10" x 12" oak, all the frame work was mortise and tenon with oak pins, the roof shingles were also hand cut, there were plenty rats under the barn