A machine invented by Mr. Erskine for raising water by means of a centrifugal force combined with the pressure of the atmosphere. This machine consists of a vertical tube resting upon a pivot, and having at top two horizontal hollow arms, near the extremity of each of which, but on opposite sides, is a valve opening outwards; whilst near the bottom of the vertical tube, and below the surface of the water to be raised, is a valve opening inwards. On the upper part of the arms are two holes, with screw-caps, and through these holes water is poured previous to setting the machine in motion; by which means the air is forced out of the machine, and the water supported in the tube by the foot-valve at the bottom. The holes in the arms being secured by their screw-caps, and a rapid rotatory motion being communicated to the tube, the water in the arms acquires a centrifugal force, opens the valves near the extremity of the arms, and flies out with a velocity nearly equal to that of the arms, discharging itself into a circular trough.

Although extremely ingenious and simple, this machine is not equal in effect to a well-made pump; and as the fluid is forced up the vertical tube into the arms by the pressure of the atmosphere, it is incapable of raising water to a height exceeding 33 feet.