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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) 
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