It is called a sweep . It is a turned by a draft animal walking round and round it . The two small pinion gears are power takeoffs to power some type of machinery with a drive shaft . Check out the videos at the old thrasher reunions . They usually have these things running for demonstration purposes . The link below shows one in action.
I've always heard those called a "Whim", and they typically had a winding drum used as a winch in mining or logging.
Guess Bruce is going to need to harness his hamster in order to drive his new accessory set?!?! ;c)
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