Float Glass in Top 50 Inventions

Here, then, are the breakthroughs of our time.

1959--FLOAT GLASS
There's a reason old windowpanes distort everything: They were made by rapidly squeezing a sheet of red-hot glass between two hot rollers, which produced a cheap but uneven pane. British engineer Alastair Pilkington revolutionizes the process by floating molten glass on a bath of molten tin--by nature, completely flat. The first factory to produce usable float glass opens in 1959; an estimated 90 percent of plate glass is still produced this way.

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