It is arranged simply: two glass tubes with a length of about 100 mm, diameter of inner hole at least 10 mm, and two lines of hose with a length of about 600 mm each. Connect it all as shown in the figure, filling half colored water, kerosene, or glycerol. This level is always ready to work. So his testimony was true, the upper hose should not contain the fluid. N. BELOV, D. Imabari, Chuvashia
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