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
Hand Lens 10×: a Small, Steep Lens Ground and Mounted
A 10× hand lens is a small convex lens of about 25 mm focal length: held close to the eye, its magnifying power is about a quarter of a metre divided by the focal length. Grind a small pair of discs to a steep curve as for any convex lens, then seat the convex one in a turned wooden ring with a cord to carry it.
The picture: a low-power reading magnifier on a dictionary page; a 10× hand lens works the same way with a much smaller, steeper lens.
Ilọsíwájú
A week
Ìlànà
1
1
Two small discs
Two small discs
Cut two small glass discs, about 15 mm across, from glass at least 5 mm thick (each face of the lens goes over a millimetre deep), and pitch each to a short wooden handle.
Àwọn ohun èlò fún ìgbésẹ̀ yìí:
Àwo dígí1 ẹyọ
Lẹ́ẹ̀ Oda Páínì10 g
Tẹ́ẹ́rẹ́ igi líle1 ẹyọÀwọn irinṣẹ́ tí a nílò:
Ohun ìgé dígí
Ẹmú ìjẹ gíláàsì
Gíláàsì ààbò2
2
Grind to a steep curve
Grind to a steep curve
Grind them together with wet coarse grit, the same disc always on top, until the faces are steep enough (see the notebook). Then the second faces. The bottom disc is the lens.
Àwọn ohun èlò fún ìgbésẹ̀ yìí:
Omi1 lítàÀwọn irinṣẹ́ tí a nílò:
Òṣùwọ̀n Kálípà Díjítà Ìnṣì 6
Ọkà kaboidi silikoni3
3
Fine grind and polish
Fine grind and polish
Fine grits, then polish both faces on a small pitch lap with tin oxide and water until clear.
Àwọn ohun èlò fún ìgbésẹ̀ yìí:
Oxide tìnì (oxide stannic)10 gLẹ́ẹ̀ Oda Páínì30 gÀwọn irinṣẹ́ tí a nílò:
Ọkà kaboidi silikoni4
4
Check 10×
Check 10×
Focus the sun through it onto paper: the spot should be smallest about 25 mm from the lens. Grind deeper if it is longer.
Àwọn irinṣẹ́ tí a nílò:
Ìdíwọ̀n5
5
Turn the mount
Turn the mount
Turn a hardwood ring on the lathe with a seat a snug fit for the lens and a small lip. Press the lens in, warm a little pitch round the back edge to hold it, drill a hole in the rim for a cord loop.
Àwọn ohun èlò fún ìgbésẹ̀ yìí:
Tẹ́ẹ́rẹ́ igi líle1 ẹyọLẹ́ẹ̀ Oda Páínì2 g
Okùn ọ̀gbọ̀ tí a fi ìdì kùn0.5 mÀwọn irinṣẹ́ tí a nílò:
Ẹ̀rọ ìyí igi
Ìṣẹ́gún Onígun
Ọ̀bẹ ìgékúrò lórí ẹ̀rọ ìyí
Bébà ÌfáÒṣùwọ̀n Kálípà Díjítà Ìnṣì 66
6
Curve for 10×
Curve for 10×
Ń ṣí ìwé Jupyter…
7
7
Use
Use
Hold the lens close to your eye and bring the object up until it is sharp.
Àwọn ohun-èlò
6- 1 ẹyọÀyè
- 42 gÀyè
- 1 ẹyọÀyè
- 1 lítàÀyè
- Àyè
- Àyè
Àwọn irinṣẹ́ tó nílò
10- Àyè
- Àyè
- Àyè
- Àyè
Ìtọ́nisọ́nà yìí ń ṣe
Blueprint tó jọra
Àwọn blueprint wọ̀nyí pín ìmọ̀ — ọ̀nà, ohun-èlò tàbí ìlànà
CC0 Àgbègbè Gbogbogbò
Blueprint yìí ti jáde lábẹ́ CC0. O lè ṣe àdàkọ, yí padà, pín, àti lò láìsí ìyọ̀ǹda.
Ṣàtìlẹ́yìn Olùṣẹ́dá nípa rírà àwọn ọjà nipasẹ̀ Blueprint wọn Ẹ̀san Olùṣẹ́dá tí àwọn Olùtajà gbé kalẹ̀, tàbí ṣẹ̀dá àtúnṣe tuntun ti Blueprint yìí kí o sì fi sínú Blueprint rẹ gẹ́gẹ́ bí ìsopọ̀ láti pín owó-wíwọlé.