Body: "Hydraulic machinery" is the study of Hydraulic machines are machinery and tools that use liquid fluid power to do simple work, operated by the use of hydraulics, where a liquid is the powering medium.
Several topics in "Hydraulic machinery" include hydraulic motors and hydraulic cylinders.
Some reasons we look at "Hydraulic machinery" include Hydraulic systems use liquid fluid power to do simple work, operated by the use of hydraulics, where a liquid is the powering medium. Heavy equipment is a common example.
Joseph Bramah are some authorities of "Hydraulic machinery".