"In pursuing his experiments on the weight of the air, Pascal was led to inquire into the general laws of the equilibrium of fluids, and in the year 1653, he composed two treatises [De l'Equilibre des Liqueurs and De la Pesanteur de la Masse de l'Air] on that subject which were not published till 1663, the year after his death. In order to determine the general conditions of the equilibrium of fluids, Pascal supposes two inequal apertures to be made in a vessel filled with a fluid and closed on all sides. If two pistons are applied to these apertures, and pressed by forces proportional to the area of the apertures, the fluid will remain in equilibrio. But the most remarkable part... is his application of the general principle to the construction of what he calls the Mechanical Machine for multiplying forces, an effect which, he says, may be produced to any extent we choose, as one man may by means of this machine, raise a weight of any magnitude. This new machine is the Hydrostatic Press, first introduced by our celebrated countryman M. Bramah..."