The Intriguing Circles in Old Pub Windows: A Closer Look
If you've ever found yourself sipping a pint in a historic pub, you might have noticed a peculiar detail: some of the older windows feature distinct, circular glass sections. These aren't just decorative quirks; they tell a story about the history of glassmaking and the practicalities of early manufacturing. So, why do old pub windows have circles? The answer lies in a fascinating process called "crown glass" manufacturing.
Understanding Crown Glass: The Birth of the Bullseye
Before modern mass-production techniques, creating large, flat sheets of glass was a labor-intensive and often imperfect process. One of the primary methods used for centuries was known as "crown glass." Here's how it worked:
- Blowing the Bubble: Craftsmen would gather a molten blob of glass on the end of a long, hollow tube, called a blowpipe.
- Creating the Globe: They would then blow into the pipe, creating a hollow globe of glass. This globe was swung and rotated, and often reheated, to enlarge and shape it.
- The "Crown": The skilled glassblower would then detach the globe from the blowpipe and, while still molten, spin it rapidly. This centrifugal force flattened the globe into a circular disc, resembling a crown or a pancake.
- The Bullseye: The thickest part of this disc was at the center, where the pontil rod (the tool used to detach it from the blowpipe) was attached. This thick, circular center is what we now recognize as the "bullseye" in old pub windows.
The process of spinning and flattening resulted in a glass disc that was thicker in the middle and thinner towards the edges. After cooling, these discs were cut into smaller panes, with the bullseye often being the most prominent and sometimes unusable section. This is why you'll frequently find these circular features in the windows of older buildings, especially pubs, where they were a common byproduct of this glassmaking method.
Why Pubs? The Practicalities and Aesthetics
Pubs, being some of the oldest and most consistently maintained establishments in many communities, often retain original architectural features, including their windows. Several factors made crown glass a popular choice for these public spaces:
- Availability and Cost: For a long time, crown glass was the most accessible and relatively affordable method for producing window glass.
- Unique Appearance: The imperfections and subtle distortions created by the crown glass process gave windows a unique character. The bullseye itself, while a manufacturing artifact, became an iconic visual element, adding to the historic charm and ambiance of a pub.
- Light Diffusion: The slight variations in thickness and the presence of the bullseye could subtly diffuse light, creating a softer, more inviting interior atmosphere.
As glassmaking technology advanced with the development of the "plate glass" process, which produced larger, flatter, and more uniform sheets, the crown glass method gradually declined. However, the legacy of this earlier technique lives on in the enduring presence of these circular panes in our historic buildings.
The Lasting Appeal of the Bullseye
Today, windows with bullseye panes are often sought after for their historical authenticity and decorative appeal. They serve as a tangible link to the past, reminding us of the craftsmanship and ingenuity of earlier eras. The next time you're in an old pub, take a moment to appreciate the bullseye in the window. It's more than just a glass circle; it's a piece of history.
Frequently Asked Questions about Old Pub Windows
How were the circles in old pub windows made?
The circles, known as bullseyes, were a byproduct of the crown glass manufacturing process. Molten glass was blown into a bubble, then spun rapidly while molten. This centrifugal force flattened the bubble into a disc, with the thickest part at the center where it was attached to a pontil rod. This thick center is the bullseye.
Why are they called "bullseyes"?
They are called bullseyes because the thick, circular section in the center of the glass disc resembles the bullseye on a target or the center of an actual bull's eye.
Were bullseyes considered defects?
While the bullseye was a necessary part of the crown glass manufacturing process, it was often the thickest and sometimes the least optically clear part of the glass disc. The rest of the disc was cut into smaller panes. The bullseye itself was often discarded or used in smaller applications where its thickness wasn't an issue, but it also became a defining characteristic of this type of glass.
Are bullseye windows still made today?
Yes, bullseye glass is still produced today, though often as a specialty item for historical restoration projects or for decorative purposes. Modern manufacturing can create bullseyes with greater precision, but they retain their distinctive appearance. The original crown glass method is rarely used commercially.
