At Home: A Short History of Private Life

by Bill Bryson

The second duty, introduced in 1746, was based not on the number of windows but on the weight of the glass within them, so glass was made thin and weak throughout the Georgian period, and window frames had to be compensatingly sturdy. The well-known bull’s-eye panes also became a feature at this time. They are a consequence of the type of glass-making that produced what was known as crown glass (so called because it is slightly convex, or crown-shaped). The bull’s-eye marked the place on a sheet of glass where the blower’s pontil—the blowing tool—had been attached. Because that part of the glass was flawed, it escaped the tax and so developed a certain appeal among the frugal. Bull’s-eye panes became popular in cheap inns and businesses, and at the backs of private homes where quality was not an issue. The glass levy was abolished in 1845, just shy of its hundredth anniversary, and the abolition of the window tax followed, conveniently and fortuitously, in 1851.