National Geographic : 1943 Jan
Men Mold Molds to Bend Flat Glass for Store Fronts and Windows Special sand is used to build each kind of mold in this furnace. Glass being placed on top of the center mold will beheated tothe exact temperature at which gravity will pull it downward to the curved contour. In the smaller molds the heated glass sinks from the center asitbends. Much curved glass isused for laminated aircraft safety glass, but Libbey-Owens-Ford produces such glass by a new method which makes it possible tobend many panes simultaneously.