A new experimental technique for determining the pumping capacity of impellers in stirred tanks i s described. Data for marine propellers operoted in a well-baffled tank ore presented. I t i s shown that the pumping capacity of propellers is proportional to the product of propeller speed and the cube of propeller diameter. I Abstract: This paper presents some recent measurements on the rate of transport of sodium chloride in turbulent axisymmetric jets of water. Only mean values for velocity and concentration are considered and these are evaluated using classical transport theory.As measured by the half-concentration radius, material is seen to spread linearly with distonce downstream of the orifice beyond about ten orifice diameters. In this region for all practical purposes, both the velocity and the concentration profiles are affine. A value of 0.67 is obtained for the turbulent Schmidt number. Abstract: Protrusion of perforations* in sieve-troy construction for liquid-gas contacting results in a decrease in dry pressure drop and entrainment dilution of liquid on a tray. For 3/16-in. diam. perforations with the protrusion geometry of 0.4-in. hip diam. and 0.1 -in. protrusion above the tray, dry pressure drop over a wide range of vapor flow was reduced 50% and entrainment, from 50 to 80%, below that of o conventional sieve tray. Tray efficiency for the protruded tray remained essentially constant for 0.7