SANAA
UREMBO NA USTAWI
UJANJA
UTAMADUNI NA HISTORIA
BURUDANI
MAZINGIRA
CHAKULA NA VINYWAJI
UHANDISI WA KINYUME
SAYANSI
MICHEZO
TEKNOLOJIA
VAZI
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.
Juu
A week
Maagizo
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.
Vifaa kwa hatua hii:
Bamba la kioo1 kipande
Gundi ya Lami ya Msonobari10 g
Utepe wa mbao gumu1 kipandeZana zinazohitajika:
Kikata kioo
Koleo la kumeguka kioo
Miwani ya usalama2
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.
Vifaa kwa hatua hii:
Maji1 litaZana zinazohitajika:
Kipima-unene cha dijitali cha inchi 6
Chembechembe za kabidi ya 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.
Vifaa kwa hatua hii:
Oksidi ya bati (oksidi ya stani)10 gGundi ya Lami ya Msonobari30 gZana zinazohitajika:
Chembechembe za kabidi ya 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.
Zana zinazohitajika:
Rula5
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.
Vifaa kwa hatua hii:
Utepe wa mbao gumu1 kipandeGundi ya Lami ya Msonobari2 g
Uzi wa kitani wenye nta0.5 mZana zinazohitajika:
Kerezo cha mbao
Patasi ya Bapa-Pinda
Patasi ya kukata kazi
Sandarusi (karatasi ya kusugua)Kipima-unene cha dijitali cha inchi 66
6
Curve for 10×
Curve for 10×
Inapakia daftari la Jupyter…
7
7
Use
Use
Hold the lens close to your eye and bring the object up until it is sharp.
Vifaa
6- 1 kipandeKishikilia Nafasi
- Kishikilia Nafasi
- 1 kipandeKishikilia Nafasi
- 1 litaKishikilia Nafasi
- Kishikilia Nafasi
- Kishikilia Nafasi
Zana Zinazohitajika
10- Kishikilia Nafasi
- Kishikilia Nafasi
- Kishikilia Nafasi
- Kishikilia Nafasi
- Kishikilia Nafasi
- Kishikilia Nafasi
- Kishikilia Nafasi
- Kishikilia Nafasi
- Kishikilia Nafasi
- Kishikilia Nafasi
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