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Stemmed Glass Funnels Opened from a Blown Bulb
A filter funnel is a glass cone on a narrow stem: a folded filter paper sits in the cone and the clear liquid runs down the stem. Blow a bulb on a tube, cut the bulb open, spread it into a cone the shape of a folded paper, and the tube left below is the stem.
The picture: a small glass funnel standing upside down, the opened bulb on its tube stem.
Advanced
An hour per funnel, plus annealing
Instructions
1
1
Blow a bulb
Blow a bulb
Close one end of a tube, gather glass there and blow a thin bulb, as for a flask.
Materials for this step:
Glass Tubing Kit1 pieceTools needed:
Bench Glassblowing Torch
Safety Glasses
Heat-Resistant Gloves2
2
Open the bulb
Open the bulb
Heat the far end of the bulb until it softens and blow it out thin, then knock or score away the thin part, leaving a cup on the tube.
Tools needed:
Bench Glassblowing Torch
Diamond ScriberSafety Glasses3
3
Spread the cone
Spread the cone
Heat the cup's rim and spread it with the jacks, turning, into a straight-sided cone. Check it against a filter paper folded into quarters until the paper sits flat against the glass.
Materials for this step:
Filter Paper1 pieceTools needed:
Bench Glassblowing Torch
JacksHeat-Resistant Gloves4
4
Cut the stem
Cut the stem
Score and snap the tube to stem length with a slanted cut so drops run off the point, and fire-polish the end.
Tools needed:
Diamond ScriberBench Glassblowing Torch5
5
Anneal
Anneal
Anneal in the kiln at the glass's annealing temperature and cool slowly.
Tools needed:
Kiln6
6
Cone for a filter paper
Cone for a filter paper
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Materials
2- 1 piecePlaceholder
- 1 piecePlaceholder
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