• Before the earliest types of glass came to be, a window would be a simple hole in the side of a building, over which could be hung unrefined animal-skin drapes at night-time. Not terribly comfy! How did the modern glass window come about?

    When Were Glass Windows Invented?
    Glass, as a product, is uncommon in nature. Typically, it comes in the kind of obsidian– which is totally black. Synthetic glass initially happened prevalent in ancient Egypt and Mesopotamia in around 3500 BCE, and became used for vases and cups thousands of years after that.

    Glass windows, on the other hand, came much later on. The ancient Romans used them, sporadically, in the more upmarket vacation homes and government buildings– though their optical qualities were far behind what we may anticipate today. In particular locations, like churches, this problem became a chance: stained glass windows permitted the representation of particular spiritual scenes. In this setting, openness didn’t matter.

    The earliest kinds of window glass were ‘broad sheet’. These were made by very first blowing a tube of glass, and after that cutting off one side and rolling the entire thing flat.

    The problem of producing glass windows made them something of a status sign– and this continued right as much as Tudor England, where only the most affluent homes might afford windows of a good size. In Europe, the Italian renaissance left no element of culture or market untouched. Windows there became taller and sleeker, and separated by mullions and transoms (the wood crossbeams which stumble upon the surface area of a window). As time passed, these aspects were made progressively narrower– so that more light might go through the window.

    The Sash Window
    The 17th century saw the introduction of a totally different sort of window: the sash window. This range of window included 2 moving panels, which could move behind one another to develop an opening. Windows of this sort required to be made from ‘crown glass’: a more budget-friendly material developed by spinning discs of the stuff, and then cutting those discs into broad sheets.

    Modern Windows
    Today, our windows are nearly generally made from machined ‘float’ glass. This process came about in the mid 19th century, and though it’s been extensively improved since then, the principles utilized today stay the very same: the molten glass is poured into a bath of molten tin. The two materials are immiscible, indicating the sheet floats upon the molten tin as it cools (like oil may float on water). The result is a perfectly smooth sheet on both surface areas, which, after a bit of additional treatment, ends up being completely transparent.

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