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IZINTO EZIGQOKWAYO
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.
Osezingeni eliphezulu
A week
Imiyalelo
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.
Izinto zokwakha zalesi sinyathelo:
Ushidi wengilazi1 ucezu
Iglu Yetiyela Lepayini10 g
Umucu wokhuni oluqinile1 ucezuAmathuluzi adingekayo:
Isisiki sengilazi
Udlawu lokuluma ingilazi
Izibuko zokuphepha2
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.
Izinto zokwakha zalesi sinyathelo:
Amanzi1 ilithaAmathuluzi adingekayo:
I-Caliper Yedijithali Yamayintshi Ayi-6
Amagcubu e-silicon carbide3
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.
Izinto zokwakha zalesi sinyathelo:
I-oksayidi kathini (i-stannic oxide)10 gIglu Yetiyela Lepayini30 gAmathuluzi adingekayo:
Amagcubu e-silicon carbide4
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.
Amathuluzi adingekayo:
Irula5
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.
Izinto zokwakha zalesi sinyathelo:
Umucu wokhuni oluqinile1 ucezuIglu Yetiyela Lepayini2 g
Intambo ye-linen enewaksi0.5 mAmathuluzi adingekayo:
Umshini wokuphendula ukhuni
Isikweletho Esigobile
Insimbi yokuhlukanisa emshinini wokuphotha
Iphepha LokugayaI-Caliper Yedijithali Yamayintshi Ayi-66
6
Curve for 10×
Curve for 10×
Ilayisha incwadi ye-Jupyter…
7
7
Use
Use
Hold the lens close to your eye and bring the object up until it is sharp.
Izinto
6- 1 ucezuIsibambeli
- Isibambeli
- 1 ucezuIsibambeli
- 1 ilithaIsibambeli
- Isibambeli
- Isibambeli
Amathuluzi Adingekayo
10- Isibambeli
- Isibambeli
- Isibambeli
- Isibambeli
- Isibambeli
- Isibambeli
- Isibambeli
- Isibambeli
- Isibambeli
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