UBUHANZI
UBWIZA N'UBUZIMA
UBUKORIKORI
UMUCO N'AMATEKA
IMYIDAGADURO
IBIDUKIKIJE
IBIRIBWA N'IBINYOBWA
UBWUBATSI BUSUBIRA INYUMA
UBUMENYI
SIPORO
IKORANABUHANGA
IBYAMBARWA
Magnifying Glass from a Hand-Ground Lens
A magnifying glass is a convex lens in a frame with a handle. A typical one has a focal length of 25 cm, an optical power of 4 dioptres, and is sold as "2×": its magnifying power is 0.25 m × 4 + 1 = 2 for an eye whose near point is 25 cm. Here the lens is ground plano-convex from crown glass (refractive index about 1.52). For a plano-convex lens the focal length is R / (n − 1), so a 25 cm focal length needs a curve of radius about 13 cm. The lens is then set in a turned wooden ring with a handle; those sizes are ours.
Hejuru
2–3 days
Amabwiriza
1
1
Grind the lens
Grind the lens
Following the lens-grinding blueprint, grind one face of a glass disc to a spherical curve of about 13 cm radius, working down through the grits, then polish it clear with cerium oxide on a pitch lap. Leave the other face flat.
Ibikoresho by'iyi ntambwe:
Ikibaho cy'ikirahure1 igice
Ubunyu bwa gudurona ya pine100 gIbikoresho bikenewe:
Umurongo w'ipima
Udukombe twa karubide ya silikoni
Umuti wo gutunganya wa oksidi ya seriyumu2
2
Check the focus
Check the focus
Hold the lens in sunlight and move a card behind it until the spot is smallest; the distance from lens to card is the focal length and should be close to 25 cm. Do not look at the Sun through it.
Ibikoresho bikenewe:
Umurongo w'ipima3
3
Turn the frame
Turn the frame
Turn a ring from a hardwood blank with a groove on the inside just wider than the lens edge, and part it off.
Ibikoresho by'iyi ntambwe:
Igihimba cy'Igiti Gikomeye1 igiceIbikoresho bikenewe:
Imashini ikerekeza ibiti
Igisongo cy'inguni
Icyuma cyo guca ku ruziga4
4
Turn the handle
Turn the handle
Turn a handle from a hardwood dowel and fix it into a hole drilled in the ring.
Ibikoresho by'iyi ntambwe:
Udukoni tw'ibiti bikomeye1 igice
Epoksi y'Ibice Bibiri5 mlIbikoresho bikenewe:
Imashini ikerekeza ibiti5
5
Set the lens
Set the lens
Saw the ring through at the handle, spring the lens into the groove, glue the cut closed and wax the wood.
Ibikoresho by'iyi ntambwe:
Igishashara10 gIbikoresho
6- 1 igiceUmwanya
- Umwanya
- 1 igiceUmwanya
- 1 igiceUmwanya
- Umwanya
- 10 gUmwanya
Ibikoresho bikenewe
6- Umwanya
- Umwanya
- Umwanya
- Umwanya
Iki gishushanyo gikora
Blueprint zijyanye
Izi blueprint zisangira ubumenyi — uburyo, ibikoresho cyangwa amahame
CC0 Umurenge rusange
Iyi blueprint yasohowe munsi ya CC0. Ushobora gukoporora, guhindura, gukwirakwiza no gukoresha nta kwemererwa.
Shyigikira Umuremyi ugura ibicuruzwa binyuze muri Blueprint ye Komisiyo y'Umuremyi byashyizweho n'Abacuruzi, cyangwa kora verisiyo nshya y'iyi Blueprint ukayinjiza nk'isano muri Blueprint yawe kugira ngo musangire inyungu.