UBUHANZI
UBWIZA N'UBUZIMA
UBUKORIKORI
UMUCO N'AMATEKA
IMYIDAGADURO
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UBUMENYI
SIPORO
IKORANABUHANGA
IBYAMBARWA
Round-Bottom and Florence Flasks Blown from Glass Tube
A round-bottom flask is a glass sphere on a tubular neck: the round shape heats evenly and stands up to vacuum, so it is the flask for boiling and distilling. Blow it from the end of a borosilicate tube; flatten the bottom while soft and it becomes a Florence flask that stands on the bench.
The picture: our diagram of the steps, from tube to round-bottom and Florence flask.
Hejuru
An hour per flask, plus annealing
Amabwiriza
1
1
Close and gather
Close and gather
Close one end of the tube in the flame as for a test tube. Keep heating and turning the closed end, pushing gently, so glass gathers into a thick knob for the bulb.
Ibikoresho by'iyi ntambwe:
Agafuka k'imiyoboro y'ikirahure1 igiceIbikoresho bikenewe:
Itara ryo ku meza ryo guhuha ikirahure
Amadarubindi y'umutekano
Uturindantoki twihanganira ubushyuhe2
2
Blow the bulb
Blow the bulb
Take the gather out of the flame and blow gently into the open end while turning, so the bulb grows round. Reheat and blow again until it is the size you want.
Ibikoresho bikenewe:
Itara ryo ku meza ryo guhuha ikirahure
Ikigereranyo cya Digitale cy'Amasentimetero 6Amadarubindi y'umutekano3
3
Flat bottom for a Florence flask
Flat bottom for a Florence flask
For a flask that stands, soften the bottom of the bulb and press it gently on a flat plate.
Ibikoresho bikenewe:
Itara ryo ku meza ryo guhuha ikirahureUturindantoki twihanganira ubushyuhe4
4
Cut and finish the neck
Cut and finish the neck
Score and snap the tube to neck length, fire the edge smooth and flare it a little with the jacks so a stopper or joint fits.
Ibikoresho bikenewe:
Agati ko gushushanya k'idayimaniItara ryo ku meza ryo guhuha ikirahure
Jacks (ifatanya ry'umukozi w'ikirahuri)5
5
Anneal and check
Anneal and check
Anneal in the kiln at the glass's annealing temperature and cool slowly. Fill with measured water to find and mark the volume. Stand round flasks in a cork ring.
Ibikoresho by'iyi ntambwe:
Amazi1 litiroIbikoresho bikenewe:
Itanura
Igikoresho gipima ibitembaAgati ko gushushanya k'idayimani6
6
Bulb size for a volume
Bulb size for a volume
Gupakira ikaye ya Jupyter…
7
7
Limits
Limits
The flask's form and why it is round are from Wikipedia; the blowing is our lampwork practice. Heat only borosilicate flasks, and never boil in a flask with a scratched or unannealed wall.
Ibikoresho bikenewe
8- Umwanya
- Umwanya
- Umwanya
Iki gishushanyo gikora
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