Abstract
This paper reports the result of measuring the pressures and velocities of the flow of water in a pipe bend which is curved at right angle in a horizontal plane. As the preliminary experiment, the motion of coloured water stream lines in a glass bend pipe had been observed. The glass pipe experiment shows that every coloured stream line above the horizontal plane through the pipe centre forms a helix entirely confined into the upper half of the pipe, and the similar motion occurs in the lower half. In the begining part of the curved pipe the velocity decreases towards the outer side of the bend, while the pressure increases. Both the velocity and pressure curves turn into similar singular forms in the last part of the bend. Some qualitative considerations were made on the experimental results.
