Back in 1915, Unicycles weren’t as cool as they were know… actually, they didn’t even make sense. Check out this ad from the May 1915 issue of Boy’s Life:
Not sure what the logistic of this is. Looks like a kid hanging inside a hula hoop attached to an old school push lawnmower. Besides the fact that this is more likely to provide broken bones than fun, they also expect kids to sell these.