Hydraulic Machine Exerting Pressure
Illustration of a hydraulic machine. "A principle known as Pascal's Law states that pressure exerted on a liquid in a closed vessel is transmitted equally and undiminished in all directions." If a, A, p, and P respectively represent the areas and pressures, then the following proportion holds: a:A = p:P.
Claude Irwin Palmer Practical Mathematics for Home Study (New York, NY: McGraw-Hill Book Company, Inc., 1919)
Courtesy the private collection of Roy Winkelman