Modern window glass is almost perfectly flat, flatter than any pancake. It also has few if any internal imperfections, making it perfectly transparent, and it can be manufactured in large pieces, making sizeable uninterrupted shop windows possible. Old glass, especially pre-19th century glass, is full of imperfections and generally came in quite small pieces. It was often made by blowing a cylinder of glass, which the glass-blower then cut along one side and flattened out to make a sheet. Another method was to spin a mass of molten glass, producing a disc, which the glass-maker then cut up into small usable sections. Windows from the stained-glass one in medieval churches to the small panes in Tudor or Georgian windows, are glazed with glass made by hand in these ways.
Most of the time, people don’t notice the imperfections in old glass windows. But if you look closely you’ll see that their surfaces have a pleasant and characterful unevenness – which also distorts slightly what we see through them. The ancient house of Cotehele in Cornwall was built in the Tudor period; the interiors were modified in the 17th century and the building remains Tudor and Jacobean in character. Many of its windows retain their early glazing. You can see how, in my photograph, the imperfections – a series of curved and linear unevennesses or more random patterns – can be made out by looking at the shadows they cast on nearby walls and window reveals. These effects vary according to the light’s direction and intensity, but are wonderfully clear in the photograph that I took on a recent October afternoon.
The architectural character of a building is often very obvious, but sometimes reveals itself in subtle ways, catching us by surprise when a particular feature, like this window, has its time in the sun.
1 comment:
We live in a house in Washington, DC, built in 1931. The window panes are a mix of modern, entirely flat glass, and old slightly wavy glass. So the transition lasted into the 20th Century.
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