Abstract: PVC panels for a bulkhead are characterized by an elongated S-shaped cross section and an axial passage extending from top to bottom. The panels are joined by tenon in mortise joints, preferably via a spade shaped tenon. The assembly is capped with a channel to position and strengthen the upper ends of the panels. A stake positioned through the passage and into the earth also secures the panels. The panels are positioned by water flow through the passage during the sinking process. Soil stabilization chemicals can also be introduced through the passage. A nozzle for the lower end of the passage is also disclosed.

Abstract: A hypodermic syringe of the automatic, or self-aspirating, type for use in combination with cartridge ampoules closed at the lower end by a rubber diaphragm pierceable by a double-ended hypodermic needle and closed at the upper end by a slidable rubber piston comprises a combination of a syringe holder unit and a self-aspirating assembly so-adapted to generate aspirating conditions in the ampoule by the slight backward displacement of the rubber piston.

Abstract: A hypodermic syringe of the automatic, or self-aspirating, type for use in combination with cartridge ampoules closed at one end by a diaphragm pierceable by a double-ended hypodermic needle and closed at the other end by a slidable piston consists of a syringe holder adapted to generate aspirating conditions within the cartridge ampoule by the slight backward displacement of the slidable piston by means of a double plunger, one slidable within, and biased against, the other, the inner plunger being positively interengaged with the slidable piston of the cartridge ampoule, and axial movement of the outer plunger being positively restricted by means for locking the other plunger with a collet in the end of the syringe holder.

Abstract: A water treating or aeration device for transferring gases to a liquid such as used for waste water treatment. The aeration device is comprised of an elongate hollow tube supported in an upright position having a bell-shaped member attached to one end forming a chamber between the inside of the tube and the outside of the bell-shaped member. The chamber is enclosed by a ring attached to the bell-shaped member and flaring outwardly into abutment with the inside of the tube. A gas, such as air, is supplied to the chamber and discharged into the interior of the tube through a plurality of apertures in the ring closing said chamber. A cone mounted on a base plate is positioned beneath the entrance of the bell-shaped member and secured to the aeration device or tube by a plurality of adjustable legs. Air introduced into the chamber is discharged through the apertures drawing fluid in a swirling motion through said bell-shaped member up and out through the upper end of the hollow tube.