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Blown Glass Jar with a Cork Lid
A jar is blown like a bottle, but instead of a narrow neck its mouth is opened out on the pontil to nearly the full width of the body, with straight walls and a flat base so it stands and can be filled with a spoon. A wide cork punched from bark makes the lid. All furnace work, the gather, the pontil and the annealing follow the bottle blueprint.
Advanced
Half a day, plus annealing
Instructions
1
1
Gather, blow, pontil and anneal
Gather, blow, pontil and anneal
The furnace, gathering, transfer to the pontil and annealing, step by step.
2
2
Blow a straight-sided bubble
Blow a straight-sided bubble
Gather soda-lime glass, marver it into a cylinder and blow a bubble. Roll it on the marver to keep the walls straight and press the end flat on the marver for the base.
Materials for this step:
Soda-Lime Glass1 kgTools needed:
Glass Furnace Capable of Reaching 1100 Degrees Celsius
Glassblowing Blowpipe
Marver
Glassblower's Bench
Heat-Resistant Gloves
Safety Glasses3
3
Mark the shoulder
Mark the shoulder
Score a line with the jacks where the mouth will be, just beyond the full width of the body.
Tools needed:
Glassmaker's JacksGlassblower's Bench4
4
Transfer to the pontil
Transfer to the pontil
Attach the pontil to the base, crack the jar off the blowpipe at the scored line.
Tools needed:
Pontil RodGlassblower's Bench5
5
Open the mouth
Open the mouth
Reheat the open end and, turning the pontil on the bench rails, open it with the jacks until the mouth is as wide as the body. Fire-polish the rim smooth in the furnace.
Tools needed:
Glassmaker's JacksGlass Furnace Capable of Reaching 1100 Degrees CelsiusGlassblower's Bench6
6
Crack off and anneal
Crack off and anneal
Crack the jar off the pontil straight into the annealing oven and anneal it as for the bottle.
Tools needed:
Annealing OvenHeat-Resistant Gloves7
7
Grind the pontil mark
Grind the pontil mark
When cold, grind the pontil scar on the base smooth on wet abrasive so it stands flat.
Tools needed:
Sandpaper Sheet
Whetstone8
8
Cut a cork lid
Cut a cork lid
Measure the mouth's inside diameter. Punch a cork a little wider than it from thick, boiled cork bark with the cork borer, and taper its lower edge so it presses in.
Materials for this step:
Cork Bark Plank0.1 kgTools needed:
Digital Caliper 6-Inch
Cork Borer
Utility KnifeSandpaper Sheet9
9
Troubleshooting
Troubleshooting
Jar blowing troubleshooting.
Flow
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Materials
2- 1 kgPlaceholder
- 0.1 kgPlaceholder
Tools Required
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