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ÀWỌN OHUN WÍWỌ̀
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.
Olùbẹ̀rẹ̀
A few hours
Ìlànà
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.
Àwọn ohun èlò fún ìgbésẹ̀ yìí:
Ọ̀dà Betula1 kgÀwọn irinṣẹ́ tí a nílò:
Ìkòkò irin dídà
Ihò iná
Òṣùwọ̀n Díjítà Ilé Ìdáná
Ìbọ̀wọ́ Iṣẹ́ Awọ2
2
Boil it down
Boil it down
Boil it gently, stirring, until the volatile part has been driven off.
Àwọn irinṣẹ́ tí a nílò:
Ìkòkò irin dídà
Ọ̀pá ìrú igi gígùnÌbọ̀wọ́ Iṣẹ́ Awọ3
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.
Àwọn irinṣẹ́ tí a nílò:
Pẹpẹ Òkúta PẹrẹsẹỌ̀pá ìrú igi gígùn4
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.
Àwọn irinṣẹ́ tí a nílò:
Pẹpẹ Òkúta Pẹrẹsẹ
OmiÒṣùwọ̀n Díjítà Ilé ÌdánáÌbọ̀wọ́ Iṣẹ́ Awọ5
5
How much boils off
How much boils off
Ń ṣí ìwé Jupyter…
Àwọn ohun-èlò
1- 1 kgÀyè
Ìtọ́nisọ́nà yìí ń ṣe
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