ABSTRACT
Several manual methods can be used for measuring the variation of the water depth in each container, namely:
— conic point, which comes down vertically on to the water surface and allows a reading to be taken as soon as contact is made. The conic point is operated by a micrometric screw and the reading has an accuracy of about 0.2 mm. The conic point can also be connected to a millimeter scale with nonius (fig. 1, 2);
— conic point at the end of a U-shaped rod submerged in water, which makes it possible to see clearly the moment of contact of the point with the water surface,
Fig. 1.—Water level with constant total volume in both containers and fixed devices for measuring water depth.
