This is a exhibit in which the visitor is involved manually. Cycle crank is used as a driving handle. Initially we used the cycle sprocket , free wheel with chain drive. This did s not work properly due to chain falling off the sprocket. The problem was solved by converting the spokes to pulley, with nylon rope. The nylon rope joint was not satisfactory. So finally we settled for sewing m/c round leather rope. The free wheel arrangement is nice as the handle will not backfire. We have used ball bearings in housings. To give stability we have provided a Balast box at the lower portion of the table.