It is essential that the open end is rounded over so that there are no sharp edges, as it is put in the mouth to blow the bulb. How this is done is described on the Cutting Tubes page. I rotate the end of the tube in the flame at an angle using both hands.
I then remove it from the flame, put the open end in my mouth and blow, gently at first and then harder. The aim is to get the end round like a test tube bottom. It is safest to do this in several stages with the glass only just as hot as required. I heat it a little more each time to find the correct temperature. It is important not to blow while the end of the tube is still in the flame. If this is done, it will be hotter on one side and will blow out suddenly and unevenly. The bulb can not be blown to full size in one go, or it would end up too thin. The end of the tube is then heated again, while rotating it all the time in a horizontal position. I lick my lips so that the tube will rotate in my mouth.
I remove the tube from the flame and put the open end in my mouth. If it is not hot enough, I return it to the flame and try again. It is best to have the glass just hot enough to work and it is important not to blow while the tube is in the flame. I blow a small bulb on the end as shown in the picture. I then repeat the process just next to the first bulb. I blow out a second bulb of a similar diameter to the first. It must be rotated faster now because there is more weight on the softened section. I then heat both bulbs and blow gently, allowing them to merge together. It will be blown out into a spherical bulb at this stage, but a larger bulb could be made by blowing a third bulb next to the first two. If I were using a burner with a smaller flame, it may be necessary to do this anyway. The tube must be rotated very fast now or the end will sag. I only need to blow gently now because it is so much thinner. It is important to keep it rotating even while blowing. I repeat this stage until a perfectly spherical bulb is obtained. On the final blowing stage, I gradually blow harder as the glass hardens. I find that this helps to produce a more spherical bulb. It is 42mm in diameter and has an even wall thickness. blowing in three stages rather than two produces a bulb which is about 50mm in diameter using my burner. This article was co-authored by our trained team of editors and researchers who validated it for accuracy and comprehensiveness. wikiHow's Content Management Team carefully monitors the work from our editorial staff to ensure that each article is backed by trusted research and meets our high quality standards. There are 14 references cited in this article, which can be found at the bottom of the page. Glassblowing is the art of creating glass sculptures by manipulating molten glass in a very hot furnace. It is a fun way to express your creativity and try working with a new material. The most common and accessible type of glassblowing is called offhand, where you heat and shape the glass on the end of a hollow pipe. Blowing glass requires working closely with heat and glass, so make sure you take all the necessary precautions before you roll, blow, and shape the glass. The most common and accessible type of glassblowing is called offhand, which is where you heat and shaped the glass on the end of a hollow pipe. You’ll need access to a furnace that can be heated to 2 thousand degrees Fahrenheit to melt the glass.
After you put your pipe in the furnace, you’ll roll it around to gather the glass. Once you gather enough glass from the furnace, you’ll want to roll it on a marver, which is a special surface that helps distribute heat, to form a cylinder shape. You can then put the pipe on a stand and blow into it as you roll it. If the glass starts to cool, you’ll have to put it in a crucible, which is a small oven, to keep it hot and malleable until you get it the size you want.
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