2011年3月21日 星期一

Antique Lamps - Peking Glass

Antique Lamps - Peking Glass

The elegant and ethereal medium known as "glass" is simply and basically made of sand, or silica and a flux; sodium or potassium. These elements fuse together when melted at a very high temperature, resulting in the product readily recognised as glass.

Glass is an ancient invention, having been produced for the past 5000 years and particularly since the development of techniques in the 18th century. The first glass makers were found in ancient Egypt and Mesopotamia, 5000 years ago with examples of this early glass surviving today.

At the time, it was seen as a very exotic product and study has shown that the simple techniques used were held as secret by those ancient artisans.The accidental experiment came just weeks before the county r4i council is set to publish a new report on the future of the square. The first glass prRichmond says this is a way for people purchasing pet food to subsidize the SPCA, which does led bulb "a wonderful job" and is known to be underfunded.oducts were rather crude bottles and flasks, produced by moulding the basic shape from mud. The modelled shape was held by inserting a short metal rod into one end with the shape then dipped into molten glass thus forming the "core" of the flask shape. Long molten threads of glass, known as "canes", were then wound around this basic shape until the flask or bottle was complete.

Before its fall, Egypt held the monopoly on glass making throughout the known world. When the Romans invaded Egypt, they quickly adopted the glass making secrets discovered. It was, in fact, the Romans who continued the development of glass making with the introduction of glass blowing, around the 1st century BC. It was from this Roman development of glass making that led to the production of glass through out the Western world.

In the meantime, the Chinese had discovered glass which, in ancient China, was attributed with special properties such as the ability to keep evil spirits away. It was also considered to have healing properties being associated with gemstones and crystals, however, prior to the 17th century, the Chinese found little use for this product.

It should be remembered that, up until the 19th century,"I trust that with University support, you and (redacted) have compact fluorescent the integrity and skills to be change agents," the letter said. "However, it is completely within the authority of the IFC itself to decide if it has the right leadership in place to lead this organization going forward." architecture worldwide used very little glass in windows, with the Chinese favouring sheets of translucent paper. Nor was glass required for storage purposes due to China's highly developed and refined production of porcelain.

While China had been producing glass since about 700 BC with various small glass workshops operating throughout the country, most of these workshops with their small random outputs, were short lived.A team of scientists led by John Badding, a professor of chemistry at Penn led lights State, has developed the very first optical fiber made with a core of zinc selenide -- a light-yellow compound that can be used as a semiconductor.The letter, which contains redactions by the University, expressed confidence Led strip light in individuals.

沒有留言:

張貼留言