UBUHANZI
UBWIZA N'UBUZIMA
UBUKORIKORI
UMUCO N'AMATEKA
IMYIDAGADURO
IBIDUKIKIJE
IBIRIBWA N'IBINYOBWA
UBWUBATSI BUSUBIRA INYUMA
UBUMENYI
SIPORO
IKORANABUHANGA
IBYAMBARWA
Dial Spring Scale with Tare Screw: Fray & Pigg, 1881
John S. Fray and Horace Pigg of Bridgeport, Connecticut, patented this weighing scale in 1881, US 243,539. A dish sits on the standard of a frame hung on two pairs of cross-arms, so it moves straight up and down. A coil spring on a right-angle lever carries the load, and a rack on the frame turns a pinion carrying the pointer round the dial. To take up the tare, a screw rod through the front of the case moves the lever's lower end. Because the spring hangs vertically from the lever's horizontal arm, the adjustment is more sensitive and the bearing surfaces fewer.
Hagati
Workshop process
Amabwiriza
1
1
Case and frame
Case and frame
Make the upright case with removable front and top. Cast or otherwise form the frame with a standard that passes up through the top to the weighing dish, and pivot it on upper and lower cross-arms whose other ends pivot to the back of the case.
Ibikoresho by'iyi ntambwe:
Agasanduku k'iminzani1 igice
Ikadiri y'iminzani ifite amaboko yambukiranya1 igice
Isahani ipimirwaho1 igiceIbikoresho bikenewe:
Ikusanyirizo ry'ibitorezi2
2
Spring and lever
Spring and lever
Pivot the right-angle lever at the back of the frame. Hang the coil spring from its horizontal arm and connect the spring's lower end to the frame by a screw, so the tension can be regulated.
Ibikoresho by'iyi ntambwe:
Inkoni igonze ku mfuruka igororotse1 igice
Resoro izingiye y'iminzani1 igiceIbikoresho bikenewe:
Ikusanyirizo ry'ibitorezi3
3
Rack and dial
Rack and dial
Journal the pinion in a bracket so its front end passes through the dial plate and carries the pointer. Pivot the rack bar to the frame and keep it in mesh with a light spring, so the frame's descent turns the pointer.
Ibikoresho by'iyi ntambwe:
Inkoni ifite amenyo na pinion1 igice
Isura n'urushinge by'iminzani1 igiceIbikoresho bikenewe:
Ikusanyirizo ry'ibitorezi
Umutwe w'udufatanyo tunoze4
4
Tare screw
Tare screw
Pass the tare rod horizontally through the front of the case into a threaded opening in the lever's lower end, so turning it sets the pointer to zero with the container on the dish.
Ibikoresho by'iyi ntambwe:
Inkoni ifite inyenzi yo gukuraho uburemere bw'igikoresho1 igiceIbikoresho bikenewe:
Agakoresho ko gukata imizingo y'ibyumaIbikoresho
8- 1 igiceUmwanya
- Umwanya
- 1 igiceUmwanya
- Umwanya
- 1 igiceUmwanya
- Umwanya
- Umwanya
- Umwanya
Ibikoresho bikenewe
3- Umwanya
- Umwanya
Iki gishushanyo gikora
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