Flow-control valves. The purpose of flow control in a hydraulic system is to regulate speed. All the devices discussed here control the speed of an actuator by regulating the flow rate. Flow rate also determines rate of energy transfer at any given pressure.
Hooke had discovered plant cells -- more precisely, what Hooke saw were the cell walls in cork tissue. In fact, it was Hooke who coined the term cells: the boxlike cells of cork reminded him of the cells of a monastery.Hooke also reported seeing similar structures in wood and in other plants.o portrait survives of Robert Hooke. His name is somewhat obscure today, due in part to the enmity of his famous, influential, and extremely vindictive colleague, Sir Isaac Newton. Yet Hooke was perhaps the single greatest experimental scientist of the seventeenth century.
In the 17th century, the English physicist Robert Hooke discovered plant cells while examining cork under a microscope. He was the first to refer to the units as cells because their boxy appearance...