Abstract: Agitator for the stirring of liquids which are enclosed in vessels the inner space of which is accessible through a hole in the wall of the vessel and of a small dimension compared to the dimension of the vessel, the agitator comprising an actuating organ and a turnable shaft for the rotation of the organ, which organ has the form of a screw with a larger diameter than said hole. The thread of the screw is formed of a coiled stripe the width of which is smaller than the width of the largest cross section of the hole and with a pitch which is so large compared to the thickness of the stripe and the height of the walls of said hole that, when the stripe forming the thread is inserted into the hole with a portion positioned on the one side of the center axis of the screw, the portions forming the thread on the opposite side of the axis will find room outside the projection of the hole at both sides of the wall through which the hole extends.

Abstract: Fluid flow in parallel-connected conduits is regulated by sensing the pressures and/or temperatures at the junctions of the conduits, and regulating the supply of power to a fluid propelling means operable in one of the conduits in accordance with a signal which is representative of the sensed pressure drop and/or temperature drop between the junctions. In a furnace installation having an air preheater (14) in a duct (12) and a parallel-connected by-pass duct (18), the pressure difference and/or temperature difference between the junctions (19, 20) of the ducts (12, 18) is/are employed to generate a signal which regulates the supply of power to an induced draft fan (17) in the air preheater duct (12). The damper (21) normally provided in the by-pass duct (18) may be removed or set at its open position.

Abstract: Fibrous material is provided comprising cellulose fibers and mineral wool fibers in a weight ratio within the range from about 3:7 to about 10:1, impregnated with an amount of a water-soluble polyoxyalkylene ether alcohol sufficient to impart dimensional stability thereto and having the formula:R.sub.1 [--O--(C.sub.n.sbsb.1 H.sub.2n.sbsb.1 --O).sub.x --C.sub.n.sbsb.2 H.sub.2n.sbsb.2 --OH].sub.mwherein:R.sub.1 is hydrocarbon or hydrocarbon substituted with secondary hydroxyl groups and free from primary hydroxyl groups and having from one to about twenty-four carbon atoms;m is a number within the range from 1 to about 6;n.sub.1 is a number within the range from about 2 to about 4;n.sub.2 is a number within the range from 3 to 4; and--C.sub.n.sbsb.2 H.sub.2n.sbsb.

Abstract: A bracket assembly device for seat belts comprising a bracket attachable to a vehicle wall by a mounting screw, the bracket comprising front and rear plates having holes for the mounting screw. The front plate forms a slip opening for the webbing or supports a member having such opening. The front plate is movable in essentially a vertical direction relative to the mounting screw and rear plate. The upper displacement position of the front plate is fixed by a member which yields when a predetermined downward directed force on the front plate is exceeded.