Abstract: A self-cleaning filter for cleaning liquids from suspended matter comprises a container with filtering partitions which divide said container into parallel sections for the contaminated liquid and into a cleaned-liquid section located between the first two sections. Each contaminated-liquid section is provided with a device for backwashing the filtering partition, said device being installed with a provision for moving over the filtering partition, being pressed flexibly against it and comprising a hollow body which is open at the side of the filtering partition and communicates with the atmosphere. Arranged around the entire perimeter of the body at its open side is a circular recess with through holes in its bottom. In this recess is installed a mating plate capable of reciprocating therein so that there is a clearance between its face and the bottom of the recess, said clearance forming a chamber which communicates with the contaminated-liquid section through said holes.

Abstract: A machine for winding shells with convex ends on mandrels using thread such as resin-impregnated fibreglass threads comprises a mechanism for rotating the mandrel around its longitudinal axis, a thread guide installed on a traverse carriage located on a horizontal guide, and a mechanism for moving the carriage over the horizontal guide. The thread guide is mounted on the carriage with a provision for moving relative to it in the direction perpendicular to the mandrel axis. The horizontal guide is arranged parallel to the mandrel axis. The mechanism for moving the carriage along the horizontal guide includes of an endless flexible linkage whose position is space is set by master guide; the shape of these master guides in the rectangular system of coordinates x, y depends on the relation: ##EQU1## The flexible linkage is connected with the mandrel-rotating mechanism and with the traverse on which the thread guide is mounted.