(MUSIC)
STEVE EMBER: But it was another method of making glass --the blown glass method-- that changed the glass industry of the ancient world. It was first developed in the Roman Empire about two thousand years ago. This new technology made glass production faster and less costly. A glass container made by casting or core-forming could take a few days to make. With glass blowing, an artist could make many containers in a day.
BARBARA KLEIN: Glassblowing involves gathering hot liquid glass on the end of a metal pipe called a blowpipe. The glass reaches a temperature of about one thousand degrees Celsius. At this temperature, the glass is a bright orange color. The glassblower must turn the pipe constantly so that the thick liquid glass does not fall off the end. He or she then blows through the pipe so that the glass expands into a rounded bubble form. The blown piece of glass can be worked and formed to create many different kinds of shapes. To reshape the glass, it must be continually reheated to stay soft.
STEVE EMBER: In modern terms, the hot oven that the glassblower uses to quickly reheat the glass is called a “glory hole.” The artist can shape the hot glass using metal tools such as jacks, tweezers and shears. Or, he or she can place the hot glass on a metal table called a marver to shape the form by rolling it back and forth. Watching an expert glassblower is an exciting experience. The artist moves as quickly and as gracefully as a dancer.
最新
2013-11-25
2013-11-25
2013-11-25
2013-11-25
2013-11-25
2013-11-25