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Borosilicate Beakers Made from Wide Glass Tube
A beaker is a glass cylinder with a flat bottom and a small pouring lip; the usual low form, devised by John Joseph Griffin, is about 1.4 times as tall as it is wide. Made from wide borosilicate tube, it takes the heat of a flame or hot plate: close one end flat, open and lip the other, anneal, and mark the volumes.
The picture: a small low-form beaker with its pouring lip and volume marks.
高级
An hour per beaker, plus annealing
说明
1
1
Cut a length of tube
Cut a length of tube
Choose wide borosilicate tube and score and snap a length a little more than 1.4 times its diameter.
此步骤所需材料：
玻璃管套件1 个所需工具：
金刚石划针
6 英寸数显卡尺
安全眼镜2
2
Close the bottom flat
Close the bottom flat
Turn one end in the flame until soft, pull off the end to close it as for a test tube, then heat the closed end and press it flat on a graphite or steel plate, turning, until it stands level.
所需工具：
台式玻璃吹制喷灯
镊子（实验室）安全眼镜
耐热手套3
3
Flare the rim, pull a lip
Flare the rim, pull a lip
Heat the open end and flare it slightly with the jacks so the rim is thickened and smooth. Heat one spot of the rim and push it out with a pointed tool to form the pouring lip.
所需工具：
台式玻璃吹制喷灯
Jacks（玻璃工钳）安全眼镜耐热手套4
4
Anneal
Anneal
Put the hot beaker straight into a kiln held at the glass's annealing temperature, soak it, and let it cool slowly so no strain is left.
所需工具：
窑炉耐热手套5
5
Mark the volumes
Mark the volumes
Pour in measured water from a measuring cylinder a step at a time and scratch a line at each level with the diamond scriber.
此步骤所需材料：
水1 升所需工具：
量筒金刚石划针6
6
Griffin proportions
Griffin proportions
正在加载 Jupyter 笔记本…
7
7
Limits
Limits
The shape and proportions are as Wikipedia gives them; the working steps are our lampwork practice. Only borosilicate takes heating; an unannealed beaker can crack on its own.
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