Abstract: The invention provides a device for forming joints in a floor or pavement, generally made of concrete. The device includes a guide bar and assembling members, having oblique legs forming an inverted V. The summit of the inverted V has a part rising from it in the form of a crest with vertical sides and a horizontal edge. The guide bar has a profile with a lower part which has the shape of a two legged clamped-nail, each of the legs of the clamp-nail having on their internal side, at some distance down from the summit of the clamp-nail, a boss forming a locking means for holding together the guide bar and the assembling members when said guide bar is placed astride the crest of an assembling member.

Abstract: Apparatus to make up joints in the construction of cement flooring intended, either to definitely remain in the cement, either to be recuperated, the said apparatus having a first part whose walls interlock on a second part serving as support, which has feet that anchor perfectly in the levelling cement.

Abstract: A fluid purification system having a vertical bed of granular material disposed in a tank which communicates with a charging compartment and a discharging compartment respectively positioned above and below the tank. The charging compartment is provided with a perforated bottom plate and an injection nozzle which blows in the granular material horizontally so that it drops by gravity into the beds through the plate. The discharging compartment comprises a hopper in the form of a dihedron whose arris is inclined to the horizontal in the direction of a drainage port provided at the base of the compartment. The system is of particular utility in the nuclear and chemical industries for the purification of air contaminated with radioiodines or noxious gases.

Abstract: A set of phase shifters associated with an array of radiators of an electronically scanning antenna are each controlled by a current-limiting amplifier which has an input stage in series with an electronic switch and an output stage connected to a source of operating voltage normally blocking a pair of diodes in the associated phase shifter. A feedback loop between the two amplifier stages includes another diode serving to stabilize the current flow through the phase-shifter diodes upon closure of the electronic switch by a control device and triggering of the input stage by a signal from a reference-voltage generator.