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Wood-Tar Pitch: Tar Boiled Down (Ure, 1839)
Pitch is tar with its volatile part boiled away. Ure (1839): boil tar in an open iron pot until the volatile matters are driven off. What is left is brittle when cold and soft when warm, the binder for a chaser's pitch bowl. Boil birch tar outdoors over a gentle fire, test a drop on a cold stone, and pour it out to set.
The picture: our diagram of the pot and the drop test.
初学者
A few hours
说明
1
1
Heat the tar outdoors
Heat the tar outdoors
Weigh birch tar into an open iron pot and set it over a gentle fire outdoors, away from buildings. Keep a lid at hand to smother a flare-up.
此步骤所需材料：
桦树焦油1 公斤所需工具：
铸铁锅
火塘
数字厨房秤
皮革工作手套2
2
Boil it down
Boil it down
Boil it gently, stirring, until the volatile part has been driven off.
所需工具：
铸铁锅
木搅拌桨皮革工作手套3
3
Test a drop
Test a drop
Drop a little on a cold stone. When the cooled drop is brittle and snaps, the pitch is done; if it stays soft, boil longer.
所需工具：
平整石板木搅拌桨4
4
Pour and keep
Pour and keep
Pour the pitch onto a wet stone slab to set and weigh it. It softens again with heat.
所需工具：
平整石板
水数字厨房秤皮革工作手套5
5
How much boils off
How much boils off
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