
1) English invention 2) Glass architecture
Found on
https://www.crosswordclues.com/clue/float-glass

Float glass is a sheet of glass made by floating molten glass on a bed of molten metal, typically tin, although lead and various low melting point alloys were used in the past. This method gives the sheet uniform thickness and very flat surfaces. Modern windows are made from float glass. Most float glass is soda-lime glass, but relatively minor qu...
Found on
http://en.wikipedia.org/wiki/Float_glass

Glass formed on a bath of molten tin. The surface in contact with the tin is known as the tin surface or tin side. The top surface is known as the atmosphere surface or air side.
Found on
http://www.encyclo.co.uk/local/20933

Glass formed on a bath of molten tin. The surface in contact with the tin is known as the tin surface or tin side. The top surface is known as the atmosphere surface or air side.
Found on
http://www.encyclo.co.uk/local/21074
No exact match found.