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VAZI
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.
Kati
Minutes per tube
Maagizo
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.
Vifaa kwa hatua hii:
Seti ya Mirija ya Kioo1 kipandeZana zinazohitajika:
Kichomeo cha Bunsen2
2
Round the bottom
Round the bottom
Reheat the closed end and blow gently to make it round.
Zana zinazohitajika:
Kichomeo cha Bunsen3
3
Flange the mouth
Flange the mouth
Heat the open end and turn it out with a turnpin into a flange.
Zana zinazohitajika:
Kichomeo cha Bunsen
Kifaa cha kupanua bomba la kiooVifaa
1- 1 kipandeKishikilia Nafasi
Zana Zinazohitajika
2- Kishikilia Nafasi
- Kishikilia Nafasi
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