Abstract: A radiator comprising a plurality of longitudinally finned tubes formed from extruded aluminum and extending between upper and lower header pipes likewise of extruded aluminum. A water-tight joint is formed at the junction of each finned tube with the adjacent header by means of an interference fit nipple. The fins are shaped so as to define a gap between adjacent finned tubes through which air to be heated may be drawn. Such air enters a chamber defined between each adjacent pair of finned tubes and exits to the rear via louvers formed in the rear fins of the finned tubes, taking the general direction of arrows A. A degree of control of the heat output of the radiator may be achieved by rotation of a flap located at the bottom of the space between the radiator and the adjacent wall surface.

Abstract: A cultivating tool having a U-shaped tubular frame defining a handle which may be gripped by an operator, and two hollow legs which latter house respective anchor legs biassed outwardly by means of a respective coil spring (not shown). A housing mounted between the legs contains a power source such as an electric motor and gearbox (both not shown) controlled by a switch on the handle and driving, via a reduction drive unit, a pair of cultivator rotors. In use, the legs are pushed into the ground against the pressure of the coil springs, a control being provided to ensure that the rotors cannot rotate until pressure has been applied to the anchor legs.

Abstract: A radiator for use in hot water central heating systems is constructed from extruded aluminium alloy sections. One finned configuration of section having a tubular duct extending therethrough is used as the heat exchanger which interconnects the fluid flow and return headers. These each incorporate locking flanges which interlock with respective external slots pre-formed in the fins on each side of the heat-exchanger sections. Pressure tight fluid connections between the headers and the duct in each heat-exchanger section are made by double-ended chamfered barrel nipples.