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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.
Mwanzo
A few hours
Maagizo
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.
Vifaa kwa hatua hii:
Lami ya Mbetula1 kgZana zinazohitajika:
Chungu cha chuma cha kutupwa
Shimo la moto
Mizani ya dijitali ya jikoni
Glavu za Kazi za Ngozi2
2
Boil it down
Boil it down
Boil it gently, stirring, until the volatile part has been driven off.
Zana zinazohitajika:
Chungu cha chuma cha kutupwa
Kasia refu la mbao la kukorogaGlavu za Kazi za Ngozi3
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.
Zana zinazohitajika:
Bamba bapa la jiweKasia refu la mbao la kukoroga4
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.
Zana zinazohitajika:
Bamba bapa la jiwe
MajiMizani ya dijitali ya jikoniGlavu za Kazi za Ngozi5
5
How much boils off
How much boils off
Inapakia daftari la Jupyter…
Vifaa
1- 1 kgKishikilia Nafasi
Zana Zinazohitajika
7- Kishikilia Nafasi
- Kishikilia Nafasi
- Kishikilia Nafasi
- Kishikilia Nafasi
- Kishikilia Nafasi
- Kishikilia Nafasi
- Kishikilia Nafasi
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