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Erlenmeyer Flasks: a Blown Bulb Shaped into a Cone
Emil Erlenmeyer's flask of 1860 is a flat-bottomed cone with a straight neck: it can be swirled without spilling, vapour condenses on its sloping walls, and a funnel sits in its neck. Blow a bulb on a tube as for any flask, then shape it into a cone with a paddle while it turns and press the base flat.
The picture: an Erlenmeyer flask, drawn by NIAID (NIH BioArt).
Advanced
An hour per flask, plus annealing
Instructions
1
1
Blow a bulb
Blow a bulb
Close one end of a tube, gather glass and blow a thick-walled bulb a little larger than the base you want.
Materials for this step:
Glass Tubing Kit1 pieceTools needed:
Bench Glassblowing Torch
Safety Glasses
Heat-Resistant Gloves2
2
Shape the cone
Shape the cone
Reheat the bulb and, turning steadily, press the upper part in with a flat paddle held at an angle while blowing gently, so the sides run straight from the base to the neck.
Tools needed:
Bench Glassblowing Torch
MarverHeat-Resistant Gloves3
3
Flatten the base
Flatten the base
Soften the bottom and press it flat on the marver so the flask stands level.
Tools needed:
Bench Glassblowing TorchMarver4
4
Finish the neck
Finish the neck
Cut the tube to neck length, fire-polish and flare the rim slightly with the jacks.
Tools needed:
Diamond ScriberBench Glassblowing Torch
Jacks5
5
Anneal and mark
Anneal and mark
Anneal in the kiln and cool slowly. Fill with measured water and scratch rough volume marks.
Materials for this step:
Water0.5 literTools needed:
Kiln
Measuring CylinderDiamond Scriber6
6
Cone volume
Cone volume
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