第66章知识
后把吹管递给赫伯特,教他吹另外的一端。
the tool, the manufacture of which presented the most difficulty, was the pipe of the glass-maker, an iron tube, five or six feet long, which collects on one end the material in a state of fusion. but by means of a long, thin piece of iron rolled up like the barrel of a gun, pencroft succeeded in making a tube soon ready for use.
on the 28th of march the tube was heated. a hundred parts of sand, thirty-five of chalk, forty of sulphate of soda, mixed with two or
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