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Double Boiler: Two Tinned Copper Pans, One Hung in the Other
A double boiler, or bain-marie, sets a smaller pan in a larger one of water, so what is inside cannot get hotter than boiling water: chocolate melts without splitting and egg sauces do not curdle. Raise two copper pans as for the saucepan, give the inner one a rolled shoulder that hangs on the outer rim, rivet on handles and tin both.
The picture: copper cookware in the kitchen of Bourbilly Castle.
Advanced
Two days
Instructions
1
1
Raise the outer pan
Raise the outer pan
Raise, rivet and tin a saucepan about 22 cm across as in the saucepan blueprint; this is the outer pan for the water.
2
2
Raise the inner pan
Raise the inner pan
Raise a second, narrower pan, about 18 cm across, from a copper disc over the stake, annealing whenever it stiffens.
Materials for this step:
Copper Sheet1 pieceTools needed:
Tin Snips
Dividers
Raising Hammer
Wooden Mallet
Forming Stake
Blacksmith Forge3
3
Roll the shoulder
Roll the shoulder
Stretch the inner pan's rim outward into a shoulder wide enough to rest on the outer pan's rim, so it hangs with a gap below it for water.
Tools needed:
Forming StakeWooden Mallet
Cross Peen Hammer4
4
Handle and tin
Handle and tin
Forge and rivet an iron handle to the inner pan, then tin its inside with tin, sal ammoniac and rosin wiped with tow, as for the saucepan.
Materials for this step:
Wrought Iron Rod0.3 m
Copper Rivets3 pieces
Tin Ingot0.05 kg
Ammonium Chloride (NH4Cl)0.01 kg
Pine Rosin0.01 kg
Flax Tow0.01 kgTools needed:
Hand DrillCross Peen HammerBlacksmith Forge
Heat-Resistant Gloves5
5
Try it
Try it
Put water in the outer pan, hang the inner one in it, and heat: the water should simmer without touching the shoulder or splashing into the inner pan.
Materials for this step:
Water2 liters6
6
Water between the pans
Water between the pans
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Materials
8- 1 piecePlaceholder
- 0.3 mPlaceholder
- 3 piecesPlaceholder
- 0.05 kgPlaceholder
- 0.01 kgPlaceholder
- 0.01 kgPlaceholder
- 0.01 kgPlaceholder
- 2 litersPlaceholder
Tools Required
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