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Emergency Glass Funnel Cut from a Bottle with a Burning String (Boy Mechanic, 1913)
A glass funnel from a narrow-necked bottle: a kerosene-soaked string tied round the bottle is burned to heat a ring of glass, the bottle is plunged into water so it cracks cleanly along the line, and the neck end, edges ground smooth, becomes the funnel.
Beginner
Half an hour
Instructions
1
1
Read the Boy Mechanic
Read the Boy Mechanic
"The top or neck will then come off easily."
2
2
Tie the string
Tie the string
Soak a string in kerosene and tie it round the outside of a small-necked glass bottle where you want the cut.
Materials for this step:
Glass Bottle (Clear)1 piece
Cotton Kitchen String1 piece
Kerosene1 piece3
3
Burn and quench
Burn and quench
Outdoors, light the string and let it burn until the glass is heated, then plunge the bottle quickly into cold water. The top comes away along the line.
Tools needed:
20-Liter Bucket
Rubber Gloves4
4
Smooth the edge
Smooth the edge
Grind or file the sharp edge smooth. Use the neck end as a funnel for filling wide-necked bottles.
Materials for this step:
Sandpaper1 pieceTools needed:
Files (Hand File)5
5
Troubleshooting
Troubleshooting
Bottle funnel troubleshooting.
Flow
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6
6
History and honest limits
History and honest limits
From **The Boy Mechanic, Book 1** (Popular Mechanics, 1913), p. 412, by Jos. W. Sorenson (checked on the archive.org scan boymechanic0000unse_n5a8). Safety gear is ours.
Materials
4- 1 piecePlaceholder
- 1 piecePlaceholder
- 1 piecePlaceholder
- 1 piecePlaceholder
Tools Required
3- Placeholder
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