Crown glass was originally made in Normandy, France, but the process was introduced to Ireland through London. The name 'crown' refers to the maker's mark - a crown - used in the 1680s by the first English glasshouse to produce these discs.
Crown glass manufacture involved blowing a small bubble on a long metal blowpipe to the size of a large globe. It was then
transferred to another rod and widened into a large U-shaped bowl and finally 'flashed' or spun so fast that it flattened out into a disc.
This was a highly skilled process.
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Period glasses are made to look exactly like the original Crown glass.Because of the appealing reflective qualities, it is used in place of standard window glass.
Sometimes modern glass is used for period buildings. Float glass gives a bland mirror-like appearance when glazed in period window sashes. Horticultural Sheet additionally shows a machine wave spreading across the pane of glass, but only in one direction, giving an unattractive effect. Experts will strongly argue that Float glass Horticultural Sheet glass detract from the appearance of a period buildings .
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