Lehr
Archaeological Evidence for Glassworking, Guidelines for Recovering, Analysing and Interpreting Evidence, published by Historic England in 2018, defines lehr (or leer) as: ‘A structure used for annealing. From the 19th century they were constructed as tunnels, heated at one end. The glass passed slowly through the lehr on a system on carriers.’
Where annealing is: ‘The process of gradually cooling worked glass, which would otherwise shatter if cooled quickly.’
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