The driller is like an auger type post hole digger powered by one horse walking around the machine. The gear is stationary. The platform and everything on it (including operators) goes around and around with the horse. The auger shaft is clamped to the platform so the auger makes one revolution as the horse makes one revolution. The gears operate a winch. It appears the winch can also be cranked by hand.
Old Threshers Reunion is a 5 day Labor Day weekend event that hosts a series of horse demonstrations. Among the demonstrations were a Case thresher run off of a 6-sweep horsepower, a smaller thresher run by a 1-horse treadmill, a buck rake and Jayhawk swivel stacker, a grain auger and horse powered sawmill, and more. We were definitely interested in checking these out, so we rode along with Jordan who nabbed Ammon Weeks to ride along as well.