| In January 2003 I found the demonstration at the right
in one of the preparation rooms of the University of Texas at Austin. The
unmarked apparatus has a cylinder and piston about five inches in diameter,
which seems to be large enough to lift the enormous mass attached to the
bottom of the piston.
This is a good example of a mid-nineteenth century demonstration that is still in use 150 years later. The actual apparatus probably dates from the beginning of the 20th century, as the University of Texas opened in 1890.