Page:Works of Jules Verne - Parke - Vol 6.djvu/156

 to the wished-for temperature. Cyrus Harding thus soon had everything ready for setting to work.

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 three parts of powdered coal, composed the substance, which was placed in crucibles. When the high temperature of the oven had reduced it to a liquid, or rather a pasty state, Cyrus Harding collected with the tube a quantity of the paste: he turned it about on a metal plate, previously arranged, so as to give it a form suitable for blowing, then he passed the tube to Herbert, telling him to blow at the other extremity.

And Herbert, swelling out his cheeks, blew so much and so well into the tube—taking care to twirl it round at the same time—that his breath dilated the glassy mass. Other quantities of the substance in a state of fusion were added to the first, and in a short time the result was a bubble which measured a foot in diameter. Harding then took the tube out of Herbert's hands, and, giving to it a pendulous motion, he ended by lengthening the malleable bubble so as to give it a cylindro-conic shape.

The blowing operation had given a cylinder of glass terminated by two hemispheric caps, which were easily detached by means of a sharp iron dipped in cold water; then, by the same proceeding, this cylinder was cut lengthwise, and having been rendered malleable by a second heating, was spread out on a plate with a wooden roller.

The first pane was thus manufactured, and the windows at Granite House were soon all furnished with panes; not very white, perhaps, but still sufficiently transparent. As to bottles and tumblers, that was only play. They were satisfied with them just as they came from the tube. Pencroft had asked to be allowed to "blow" in his turn; and it was great fun for him; but he blew so hard that his productions took the most ridiculous shapes, which he admired immensely.