Before 1959, most glass had a distorted surface. In the 1950s, the English engineer Alastair Pilkington developed a method for mass production of completely uniform, flat glass. The uniform surface is created as the molten glass flows over a bath of molten tin. This process is called the Float Glass Method and it was commercially taken into use in 1959. Alastair Pilkington was employed as an engineer by Pilkington Brothers Ltd. but was not related to the company in terms of family.