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Crown glass. Crown glass was an early type of window glass. In this process, glass was blown into a "crown" or hollow globe. This was then transferred from the blowpipe to a punty and then flattened by reheating and spinning out the bowl-shaped piece of glass (bullion) into a flat disk by centrifugal force, up to 5 or 6 feet (1.5 to 1.8 metres) in diameter.
A window is an opening in a wall, door, roof, or vehicle that allows the exchange of light and may also allow the passage of sound and sometimes air.Modern windows are usually glazed or covered in some other transparent or translucent material, a sash set in a frame [1] in the opening; the sash and frame are also referred to as a window. [2]
The first electric synthesizer was invented in 1876 by Elisha Gray who accidentally discovered that he could control sound from a self vibrating electromagnetic circuit and in doing so, invented a basic single note oscillator. This musical telegraph used steel reeds whose oscillations were created and transmitted, over a telephone line, by ...
The Free Society of Traders built a glass factory close to Philadelphia in the Province of Pennsylvania during the early 1680s. The works, located at Frankford, [55] was managed by Joshua Tittery, who was also a potter. [56] They produced bottles and window panes for several years under the guidance of English glass blowers. [57]
A bulldozer is a crawler or a continuous tracked tractor, equipped with a substantial metal plate or blade, used to push large quantities of soil, sand, or rubble during construction work. In 1923, a farmer named James Cummings and a draftsman named J. Earl McLeod co-invented and created the first designs.
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Six Flags opened in 1961 in Arlington. These photos from the Star-Telegram show long-gone rides, historic moments and fun memories from the 1960s into into 2010s.
The term "sash windows" is used interchangeably with the term "box sash windows" in the United Kingdom, and frequently used to describe the same thing. Historically box sash windows are heavier and more stately in nature than modern sash windows, but both terms are used within the industry when referring to the same type of window. [citation ...