Abstract: A solar-energy collector has a frame receiving a double-pane unit consisting of a pair of transparent panes hermetically sealed together and defining the flow chamber for the heat-collecting fluid. The frame also supports a cover pane which defines, with the aforementioned unit, a heat-insulating dead-air space. The pane of the unit turned toward the sun is provided with an emission-limiting coating on its side facing the dead-air space while the pane of the unit turned away from the sun is provided with means for increasing its heat-absorption capacity. The frame members at opposite sides of the collector can be provided with fittings for connecting the collector to a source of the heat-absorbing fluid and to the output line of the collector.

Abstract: A light transmitting panel composed of at least two panes held in spaced relation by a spacer assembly to define at least one space between panes is given improved sound damping properties by employing panes which exhibit at least two different masses per unit surface area, by causing the space between panes to be sealed from the external atmosphere, and by filling this space with a gaseous medium whose composition is such that the velocity of sound propagation therethrough is different from that in dry air at the same pressure and temperature as the medium.

Abstract: A light transmitting panel composed of at least two panes held in spaced relation by a spacer assembly to define at least one space between panes is given improved sound damping properties by giving such space a thickness of greater than 9mm, by causing the space between panes to be sealed from the external atmosphere, and by filling this space with a gaseous medium composed of air and at least one other gas, the air constituting at least 30%, by volume, of the medium, and whose composition is such that the velocity of sound propagation therethrough differs by at least 5% from that in dry air at the same pressure and temperature as the medium.

Abstract: A stack of rectangular workpieces to be peripherally bonded to one another, such as a unit of two glass plates and an interposed spacer frame, is transported along a generally U-shaped horizontal path having two parallel runs and one transverse course constituted by a number of active or passive conveyor stages. A pair of power presses with complementarily oriented L-shaped jaws are inserted in the two runs, each press acting upon the leading and proximal edges of the stack. A control station common to the two runs is inserted between the two presses and carries an adhesive injector having a nozzle head alternately trainable upon a stack on one or the other press. A conveyor stage in each run, immediately downstream of the respective press, is bodily shiftable between that press and an adjoining stage to give the adhesive injector at the control station access to the press side clamping the leading edge of the stack.