fig2 the glass assemblies do not rest upon one another with their entire weight as they would were the rollers 60 to extend horizontally however each glass assembly does bear to some extent the weight of an adjacent glass assembly due to the desired tilt of the series of rollers 52 and 60 thereby maintaining the glass assemblies in contact with one another once the vacuum chamber has been refilled with a low k c gas as desired the door 20 is opened and the glass assemblies 70 are removed as a unit along the conveyor onto section iii thereof the openings 100 are then guickly plugged as by a polymeric plug or as shown in fig4 through the use of an expanding head rivet 110 such as a 34 pop 34 rivet for low k c gases that are heavier than air such as argon the glass assemblies are oriented in the vacuum chamber so that they emerge from the vacuum chamber with their openings 100 positioned at an upper corner so as to avoid any tendency of the gas to flow by gravity from the opening if desired the rollers or other conveyor supports can be tilted as desired so that the corner of each glass.