Abstract: A centrifuge, for separating a fluid feed into two fluids, includes a rotor shaft and a rotor housing within which is a set of concentric, equal spaced cylindrical shells providing elongated annular chambers for parallel flows of fluid. Distributor means extends radially from the shaft within one end housing portion to furnish fluid separately to the chambers. One collector means to receive one separated fluid extends radially from the shaft within the other end housing portion to communicate with the chambers. A second collector means is located preferably at the same transverse plane passing through the shaft by using radially extending walls within that end portion of the housing to divide it into a number of pie-shaped chambers, each having an outlet adjacent the shaft. Each collector means includes some of these pie-shaped chambers.

Abstract: A novel hopper vehicle, illustratively a freight hopper car, has a floor with two longitudinal hoppers and a pair of side-opening doors on opposite sides of the center line of the vehicle. Each door provides a part of one of the hoppers and is pivotally mounted on a side sill of the vehicle. Preferably each door is a wrap-around door to provide also a lower part of a side of the body of the vehicle and its pivotal mounting is on an intermediate side sill that extends between the sloping end walls of the body of the vehicle at an intermediate elevation. The body of the vehicle has fixed side walls. For the central portion of the floor of the car body there is a longitudinally-extending, inverted V-shaped panel that is mounted above the intermediate portion of the center sill of the car and that provides by its sloping walls the other part of the hoppers. In the construction with wrap-around doors the fixed side walls form only a part of the sides of the body.

Abstract: A low-profile platform scale has a horizontal base, a lower primary U-shaped lever, an upper secondary U-shaped lever, a horizontal platform, and load cell means mounted on the base. The base has a unitary structure including a front pair and a rear pair of modified vertical angle irons connected to the ends of a horizontal shallow rectangular tubing and supporting short inverted channel irons each with one leg shorter than the other, to provide a pair of spaced upstanding portions of the base at the central part of the front and rear margins of the base with a portion of the short flanges and a portion of the long flanges of the pair of channel irons providing mounting means at upper and lower elevations as vertical flat surfaces facing the ends of the scale. These flat surfaces are at two transverse vertical planes.