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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.
Abantado
An hour per beaker, plus annealing
Mga Tagubilin
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.
Mga materyales para sa hakbang na ito:
Kit ng mga Tubong Salamin1 pirasoMga kailangang kasangkapan:
Panggurit na Diyamante
Digital na Kalibrador 6 Pulgada
Salaming pangkaligtasan2
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.
Mga kailangang kasangkapan:
Pang-ihip ng salamin na pang-mesa
Sipit (panlaboratoryo)Salaming pangkaligtasan
Guwantes na Matibay sa Init3
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.
Mga kailangang kasangkapan:
Pang-ihip ng salamin na pang-mesa
Jacks (sipit ng manggagawa ng salamin)Salaming pangkaligtasanGuwantes na Matibay sa Init4
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.
Mga kailangang kasangkapan:
PugonGuwantes na Matibay sa Init5
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.
Mga materyales para sa hakbang na ito:
Tubig1 litroMga kailangang kasangkapan:
Silindrong panukatPanggurit na Diyamante6
6
Griffin proportions
Griffin proportions
Naglo-load ng Jupyter notebook…
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.
Mga Kinakailangang Kasangkapan
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