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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.
中级
An hour
说明
1
1
Blow a large bulb
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.
此步骤所需材料：
玻璃管套件1 个所需工具：
台式玻璃吹制喷灯
窑炉
安全眼镜
耐热手套2
2
Cut the caps
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.
所需工具：
金刚石划针
玻璃钳安全眼镜3
3
Grind the edges
Grind the edges
Rub each edge on a flat plate with wet fine grit until round and smooth. Wash and dry.
此步骤所需材料：
碳化硅磨料20 克
水1 升所需工具：
6 英寸数显卡尺4
4
Caps from one bulb
Caps from one bulb
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