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.