Abstract: With gas injection equipment used to inject a gas into a liquid the problem exists that the conducting element filled with gas will experience buoyancy. To eliminate this buoyancy, the conducting element is open at its free end and closed at its other end, bearing there a fastening connection permitting its connection to a gas supply distributor. The conducting element is surrounded by a perforated, hose-like membrane, and a gas supply conduit discharges into the area of the membrane. To facilitate fabrication and assembly as well as in order to reduce material consumption, the conducting element is configured in such a way that its gas supply conduit penetrates the fastening connection as an axial blindend bore, and that in the area of the membrane at least one radial discharge is present. A transverse groove preferably extends from the discharge of the gas supply conduit up to the free end of the conducting element, over which transverse groove gas can be uniformly distributed.

Abstract: An automobile race track toy set is provided, having a roadway formed by straight and curved raceway segments, with two lanes having embedded current conductors therein. The raceway segments include inside and outside guiding edges, along which toy vehicles slide by means of a bridge which projects beyond the lateral surfaces of the toy vehicles, and the curved raceway segments include, parallel to and spaced from the inside guiding edge, an upright supporting wall which is lower than the inside guiding edge. The bridge of the toy vehicle includes a rod-shaped, downwardly directed support member which engages the groove-shaped space formed between the inside guiding edge and the supporting wall. A molded part is further provided, having a substantially L-shaped cross section, which mates with the curvature of the inside guiding edge and which is detachable from the curved raceway segment.