caption: The image shows a drawing of a machine with a bottle on top of it, which is an apparatus used to measure the pressure of a liquid. The apparatus consists of a cylinder with a handle on one side and a cylinder on the other, connected by a series of wires. The cylinder is filled with a liquid, and the wires are connected to the cylinder, allowing the liquid to flow through it. The diagram also shows the various components of the apparatus, such as the pressure gauge, the pressure regulator, and a control panel.