Here is what they are mate
Some did have a row of chains hanging in the front, these chains stopped the grass or whatever was being swiped from being blown forward onto the back of the tractor, some were fitted with a row of hanging hinged metal plates that did the same. I put 3 blades on the plate as it was simpler to do, some had a square plate with 4 blades like a disc mower, some had a round plate like a disc with 4 blades, others had just 3 heavy chains fitted to a sort of hub, these were for more rough cutting like scrub and gorse then there were others fitted with just a long flat single wide heavy blade. the gearbox was basicly a pulley drive very much the same as the bolt-on tractor pulley that Fergy and David Brown made but adapted for these swipes. When larger swipes ant toppers came into being they were fitted with a double cutting arrangement and of course there is the flail type. The pivoting wheel on the back could be raised or lowered to help level the machine and to aid the cutting height to a certain extent, these were usualy metal or a lot of like conveyer belt sections fixed together in the round, a pneumatic tyre was not usualy used as the wheel took a lot of punishment.