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Watch Glasses Cut from a Large Blown Bulb
A watch glass is a round, shallow dish of glass, named for the glass on old pocket watches; chemists evaporate drops on it, weigh solids in it and cover beakers with it. Blow a large, even bulb, cut round caps out of its side and grind their edges smooth.
The picture: a powder (stearic acid) held on a watch glass.
Intermediate
An hour
Instructions
1
1
Blow a large bulb
Blow a large bulb
Close a tube, gather glass and blow a large bulb with an even wall, turning all the time so it stays round. Anneal it in the kiln.
Materials for this step:
Glass Tubing Kit1 pieceTools needed:
Bench Glassblowing Torch
Kiln
Safety Glasses
Heat-Resistant Gloves2
2
Cut the caps
Cut the caps
Score circles on the side of the bulb with the diamond scriber, tap from inside to run the cracks, and nibble the caps free with grozing pliers.
Tools needed:
Diamond Scriber
Grozing PliersSafety Glasses3
3
Grind the edges
Grind the edges
Rub each edge on a flat plate with wet fine grit until round and smooth. Wash and dry.
Materials for this step:
Silicon Carbide Grit20 g
Water1 literTools needed:
Digital Caliper 6-Inch4
4
Caps from one bulb
Caps from one bulb
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Materials
3- 1 piecePlaceholder
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- 1 literPlaceholder
Tools Required
7- Placeholder
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