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REVERSE ENGINEERING
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Watch Glasses Cut from a Large Blown Bulb
Gmhofmann (Wikimedia Commons) · CC BY-SA 3.0
Bubbles

Yenziwe ngu-

Bubbles

14. uMfumfu 2026IT
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Watch Glasses Cut from a Large Blown Bulb

A watch glass is a round, shallow dish of glass, named for the glass on old pocket watches; chemists evaporate drops on it, weigh solids in it and cover beakers with it. Blow a large, even bulb, cut round caps out of its side and grind their edges smooth. The picture: a powder (stearic acid) held on a watch glass.
Ophakathi
An hour

Imiyalelo

1

Blow a large bulb

Close a tube, gather glass and blow a large bulb with an even wall, turning all the time so it stays round. Anneal it in the kiln.

Izinto zokwakha zalesi sinyathelo:

Isethi Yemibhobho YengilaziIsethi Yemibhobho Yengilazi1 ucezu

Amathuluzi adingekayo:

Isibani sokuphephetha ingilazi sasetafuleniIsibani sokuphephetha ingilazi sasetafuleni
IsithandoIsithando
Izibuko zokuphephaIzibuko zokuphepha
Amagilavu Amelana NokushisaAmagilavu Amelana Nokushisa
2

Cut the caps

Score circles on the side of the bulb with the diamond scriber, tap from inside to run the cracks, and nibble the caps free with grozing pliers.

Amathuluzi adingekayo:

Isibhoboza SedayimaneIsibhoboza Sedayimane
Udlawu lokuluma ingilaziUdlawu lokuluma ingilazi
Izibuko zokuphephaIzibuko zokuphepha
3

Grind the edges

Rub each edge on a flat plate with wet fine grit until round and smooth. Wash and dry.

Izinto zokwakha zalesi sinyathelo:

AmanziAmanzi1 ilitha

Amathuluzi adingekayo:

I-Caliper Yedijithali Yamayintshi Ayi-6I-Caliper Yedijithali Yamayintshi Ayi-6
Amagcubu e-silicon carbideAmagcubu e-silicon carbide
4

Caps from one bulb

Ilayisha incwadi ye-Jupyter…

Izinto

2

Amathuluzi Adingekayo

8

Le blueprint yenza

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Isibambeli

Ingilazi yewashi

Free

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Ama-blueprint ahlobene

Lama-blueprint abelana ngolwazi — amasu, izinto noma izimiso

Round-Bottom and Florence Flasks Blown from Glass Tube

Round-Bottom and Florence Flasks Blown from Glass Tube

ngu-BubblesIT

Umsebenzi Wengilazi

21
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Microscope Slides Cut from Sheet, Coverslips from a Blown Bubble

Microscope Slides Cut from Sheet, Coverslips from a Blown Bubble

ngu-BubblesIT

Umsebenzi Wengilazi

32
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CC0 Isizinda Somphakathi

Le blueprint ikhishwe ngaphansi kwe-CC0. Ukhululekile ukukopisha, ukuguqula, ukusabalalisa, nokusebenzisa ngaphandle kwemvume.

Sekela uMenzi ngokuthenga imikhiqizo nge-Blueprint yabo IKhomishane Yomenzi kumiswe ngabathengisi, noma dala inguqulo entsha yale Blueprint bese uyifaka njengoxhumaniso ku-Blueprint yakho ukuze wabelane ngemali engenayo.

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