| This model press in the University Museum at the University
of Mississippi is 34 cm high, and shows the type of press used in early
years in printing works and to compress cotton bales.
Two mechanical powers are used here to multiply the force exerted by the human arm: the helical screw, and the long handle.
| This model of a Bramah hydraulic press is
in the collection of the United States Military Academy at West Point,
New York. It demonstrates both Pascal's law and the law of the lever. The
relatively small force exerted on the pump handle is first multiplied by
the use of a lever of the third kind. The pair of cylinders, connected
by the length of brass tubing, is then used to multiply the force a second
time. The arrangement of bearing points within the jaws of the press shows
that it was used to break samples in the form of bars.
Joseph Bramah patented this form of hydraulic press in 1795. It has no maker's name, and is about 38 cm high. A roughly similar press in the 1916 catalogue of L. E. Knott of Boston cost $34.50.