IṢẸ́ ỌNÀ
ẸWÀ ÀTI ÌLERA
IṢẸ́ ỌWỌ́
ÀṢÀ ÀTI ÌTÀN
ÌṢERÉ
ÀYÍKÁ
OÚNJẸ ÀTI OHUN MÍMU
REVERSE ENGINEERING
SÁYẸ́ǸSÌ
ERÉ ÌDÁRAYÁ
ÌMỌ̀-Ẹ̀RỌ
ÀWỌN OHUN WÍWỌ̀
Glass Pipettes: Tube Drawn to a Tip, Graduated by Weighing Water
A pipette is a straight glass tube drawn to a narrow tip: dip it in, close the top with a finger, and let out just the volume you want. Drawn and left plain it is a simple transfer pipette; marked along its length it is a graduated pipette, and a Mohr pipette starts its marks well above the tip and is read as it drains.
The picture: our diagram of a plain and a graduated (Mohr) pipette.
Àárín
Half an hour per pipette
Ìlànà
1
1
Draw the tip
Draw the tip
Heat a band of straight, even tube while turning, take it out and pull a short taper, as for a capillary. Cut it at the taper to leave a tip about 1 mm across.
Àwọn ohun èlò fún ìgbésẹ̀ yìí:
Àkójọpọ̀ Páìpù Gíláàsì1 ẹyọÀwọn irinṣẹ́ tí a nílò:
Ọ̀gọ̀ ìfẹ́ dígí orí tábìlì
Abẹ́rẹ̀ Ìkọ̀wé Dáyámọ́ndì
Gíláàsì ààbò
Ìbọ̀wọ́ Tí Ń Fara Da Ooru2
2
Finish both ends
Finish both ends
Fire-polish the tip lightly without closing it, and fire-polish the top so a finger seals it well.
Àwọn irinṣẹ́ tí a nílò:
Ọ̀gọ̀ ìfẹ́ dígí orí tábìlì
Àwọn Ìfá (Ìfá Ọwọ́)3
3
Graduate it (Mohr)
Graduate it (Mohr)
Fill above the top mark, let it drain into a weighed beaker on the balance, stopping each few grams and scratching a line at the level. Keep the first mark well above the tip.
Àwọn ohun èlò fún ìgbésẹ̀ yìí:
Omi0.2 lítàÀwọn irinṣẹ́ tí a nílò:
Òǹwọ̀n ìdọ́gba
Ago GílásìAbẹ́rẹ̀ Ìkọ̀wé Dáyámọ́ndì
Ìdíwọ̀n4
4
Mark spacing
Mark spacing
Ń ṣí ìwé Jupyter…
5
5
Use
Use
Hold it upright, tip in the liquid but off the bottom; draw liquid up with a bulb (never by mouth), close the top with your forefinger and let it down to the mark.
Àwọn irinṣẹ́ tó nílò
8- Àyè
- Àyè
- Àyè
Ìtọ́nisọ́nà yìí ń ṣe
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