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Test Tubes Made from Glass Tubing
Glass tubing is drawn continuously from molten glass and cut into lengths of about 1.5 m. A test tube is made from a length of it in the flame: turned until it softens, pulled apart to close one end, the closed end blown gently into a round bottom, and the open end heated and flared with a turnpin into a flange, which finishes the edge neatly and strengthens it so a cork can be pushed in without breaking it. Hard Bohemian glass was the usual test-tube glass in 1910.
中级
Minutes per tube
说明
1
1
Heat and pull
Heat and pull
Heat a length of tubing while turning it until the glass runs together, then draw the two pieces apart.
此步骤所需材料：
玻璃管套件1 个所需工具：
本生灯2
2
Round the bottom
Round the bottom
Reheat the closed end and blow gently to make it round.
所需工具：
本生灯3
3
Flange the mouth
Flange the mouth
Heat the open end and turn it out with a turnpin into a flange.
所需工具：
本生灯
玻璃管扩口锥
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