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Fire Grenades: Salt and Sal Ammoniac Solution in Thin Glass Bottles (Boy Mechanic, 1913)
The old 'fire grenade': a strong solution of common salt and sal ammoniac sealed in thin quart bottles, thrown into the flames to break and drench them. A historical method; keep a modern rated extinguisher as well.
Beginner
An hour
Instructions
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1
His batch
His batch
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Read the Boy Mechanic
Read the Boy Mechanic
"Dissolve 20 lb. of common salt and 10 lb. of sal ammoniac in 7 gal. of water."
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3
Make the solution
Make the solution
Dissolve 20 lb (9.1 kg) of common salt and 10 lb (4.5 kg) of sal ammoniac (ammonium chloride) in 7 gal (26.5 l) of water.
Materials for this step:
Salt1 piece
Ammonium Chloride (NH4Cl)1 piece
Water1 pieceTools needed:
20-Liter Bucket4
4
Fill the bottles
Fill the bottles
Fill thin glass bottles of about a quart, cork them tightly and seal the corks so nothing evaporates.
Materials for this step:
Glass Bottle (Clear)1 piece
Corks1 piece
Beeswax1 piece5
5
Use
Use
At a fire, throw a bottle into or near the flames so it breaks, or break off the neck and scatter the liquid on the fire. Several may be needed.
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Troubleshooting
Troubleshooting
Fire grenade troubleshooting.
Flow
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7
History and honest limits
History and honest limits
From **The Boy Mechanic, Book 1** (Popular Mechanics, 1913), p. 351 (checked on the archive.org scan boymechanic0000unse_n5a8). This is the period method as printed; it is not tested to any modern fire rating. Metric figures and wax sealing are ours.
Materials
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- 1 piecePlaceholder
- 1 piecePlaceholder
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Tools Required
1- Placeholder
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