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UBWIZA N'UBUZIMA
UBUKORIKORI
UMUCO N'AMATEKA
IMYIDAGADURO
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IBYAMBARWA
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.
Hejuru
A week
Amabwiriza
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.
Ibikoresho by'iyi ntambwe:
Ikibaho cy'ikirahure1 igice
Ubunyu bwa gudurona ya pine10 g
Agace k'igiti gikomeye1 igiceIbikoresho bikenewe:
Igikata ikirahuri
Amafashi yo kwerura ikirahure
Amadarubindi y'umutekano2
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.
Ibikoresho by'iyi ntambwe:
Amazi1 litiroIbikoresho bikenewe:
Ikigereranyo cya Digitale cy'Amasentimetero 6
Udukombe twa karubide 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.
Ibikoresho by'iyi ntambwe:
Oksidi ya etain (oksidi ya sitanike)10 gUbunyu bwa gudurona ya pine30 gIbikoresho bikenewe:
Udukombe twa karubide 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.
Ibikoresho bikenewe:
Umurongo w'ipima5
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.
Ibikoresho by'iyi ntambwe:
Agace k'igiti gikomeye1 igiceUbunyu bwa gudurona ya pine2 g
Umugozi wa lin ufite ibyuma0.5 mIbikoresho bikenewe:
Imashini ikerekeza ibiti
Igisongo cy'inguni
Icyuma cyo guca ku ruziga
Urupapuro rwo GusyaIkigereranyo cya Digitale cy'Amasentimetero 66
6
Curve for 10×
Curve for 10×
Gupakira ikaye ya Jupyter…
7
7
Use
Use
Hold the lens close to your eye and bring the object up until it is sharp.
Ibikoresho
6- 1 igiceUmwanya
- Umwanya
- 1 igiceUmwanya
- 1 litiroUmwanya
- Umwanya
- Umwanya
Ibikoresho bikenewe
10- Umwanya
- Umwanya
- Umwanya
- Umwanya
- Umwanya
- Umwanya
- Umwanya
Iki gishushanyo gikora
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