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Capillary Glass Tubes Drawn Out from Tube
A capillary is glass tube drawn out thin in the flame: heat a band while turning it, take it out and pull, and the tube stretches into a fine tube with a hair-thin bore. Chemists drew tubes out over a lamp this way, as Fownes's manual (1856) shows. Faster and longer pulls give finer bores.
The picture: glass capillary tubes on a cutting mat.
中级
An hour
说明
1
1
Heat a band
Heat a band
Hold a length of glass tube in both hands and turn it steadily in the torch flame, heating a band about 2 cm wide until it sags soft.
此步骤所需材料：
玻璃管套件1 个所需工具：
台式玻璃吹制喷灯
安全眼镜
耐热手套2
2
Out of the flame, pull
Out of the flame, pull
Take it out of the flame and pull your hands apart in one smooth movement, keeping it straight. A gentle pull gives a thicker capillary, a fast long one a finer bore.
所需工具：
安全眼镜耐热手套3
3
Cut to length
Cut to length
When cold, score the capillary with a file and snap it into lengths. For melting-point tubes, seal one end by touching it to the edge of the flame.
所需工具：
锉刀（手用锉）
直尺台式玻璃吹制喷灯安全眼镜4
4
Check and store
Check and store
Measure the outside with the caliper, sort by size and keep them in a closed jar so no dust gets in the bores.
所需工具：
6 英寸数显卡尺
玻璃罐5
5
How far to pull
How far to pull
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