Chain pump type
A series of balls placed parallel to each other are hinged or linked together in a similar manner as the buckets of a chain pump; this chain of floats is passed over two sets of pulleys or disks fixed to two horizontal shafts, the one placed vertically above the other, the said pulleys being formed to suit the diameter of the floats.
One-half of this chain of floats passes through the center of the tank holding the water or other fluid, and the other half passes outside the tank through the air. The floats, when in motion, enter through the bottom of the tank, and rise up by their buoyancy through the water; they then pass round the top pulley, descend outside the tank, and, passing over the bottom pulley, again enter the tank, and so on. If cylindrical floats are used, as described, they are fixed on the connecting links half a diameter or more apart from each other. An absurd device is described in this invention of 1865, for opening and closing the entering and exit valves of the chamber and the use of compressed air for operating them.
(Subsection 955, from p.383)
From: Gardner D. Hiscox, M.E., Mechanical Appliances and Novelties of Construction (1927), Norman W. Henley Publ. Co.