A portion of molten glass would be attached to a pontil rod. Air was then blown through the rod and into the mass to form a bubble. When it reached an appropriate size the bubble was opened, the rod was spun, and sheet glass would form by centrifugal force. Once cooled, the glass was cut. The thinnest was at the edge and the thick, opaque, area around the mark left by the pontil was known as the crown or bullseye. This technique was used well into the 17th century. While advances in glass production were introduced in the 19th and early 20th centuries, it wasn’t until 1957 that techniques used to produce float glass were developed in the United Kingdom.
The farm traces its origins to 1652. Nothing went to waste back then and bullseyes were installed above the transom of the solid front door to allow light to illuminate the hall. These were mounted high up and I needed something to stand on. The chairs and tables were antique so I lifted the camera above my head and stood on tiptoes. From where she stood she could see the LCD and provided guidance … left, too far, OK, up, more, down, OK. The larger shot shows evidence of the molten glass having been spun during production.