Q. How to define automatic float operated gauges?

In recording type gauges, automatic float operated gauges are more common. The well for the float provides room for installation of the recorder, working of float and a counter weight. Outside disturbances are damped by restricting the cross sectional area of the inlet pipe to 1/1000 of the inside horizontal area of the well. To minimize errors arising on account of lag of stylus and due to submergence of float, care is required to be taken to reduce friction of using large size float and light weight float line.