Now known as Massey Ferguson, Massey Harris produced this popular model of Hay Baler for many years. Self-powered for producing and tying bales, it was nevertheless pulled, but not powered, by a tractor. The hay lying in a field was collected by a rotary pickup and transferred across to the square baling chamber (on the left side of the machine) where it was compressed into discrete rectilinear bales, tied with twine, and ejected out the back. Most bales today are a large and cylindrical shape, but the smaller rectangular bales we typically see used for seating and decoration are still the old square bales made from a machine such as No.3. [-Greg Ball](http://www.johngregball.com/)