The document describes a rotary flask shaker that is used to shake liquid in glass flasks in research laboratories. It has a heavy platform fitted with rubber discs that can hold flasks ranging in size from 50ml to 1000ml. The platform is mounted on ball bearings and given an orbital circular motion by a motor to shake the flasks. The shaker unit comes in various platform sizes that can hold different numbers of flasks and is powered by a 0.25HP or 0.5HP motor running on 220V, 50Hz AC supply.