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If a rod of copper is annealed in a certain way it can be bent ONCE like rubber but then the crystal breaks up and it becomes as rigid as ever. Maybe this glass will act the same way." "Then try it! Don't keep me in suspense!" Perhaps Tom had been tantalizing his business manager, or maybe he really was doubtful about the flexibility of the bar.
These residues, calculated upon 100 parts of the disks employed, had the following compositions: "Cold-rolled" carbon, 1.039 per cent.; iron, 5.871. Annealed, C, 0.83 per cent.; Fe, 4.74 per cent. Hardened, C, 0.178 per cent.; Fe, 0.70 per cent.
It prevents the glass from breaking when exposed to friction or to the atmosphere. Glass is very brittle, and extremely sensitive to heat and cold. If it were not annealed it would not be strong, and would snap to pieces the moment it came in contact with the outer air.
"I asked him to sell me the piece of glass he had been making when he came in, and at first he pretended that he was not sure whether you would allow it, but at last he took a piece of gold for it, and I was to have it as soon as it was annealed. When you see it, you will understand why I was so anxious to get it." "Where is it?" asked the old man. "Show it to me."
Though stays will prevent the ends of the boiler blowing off, it is very advisable to rivet them through the flanges to the ends of the barrel, as this gives mutual support independently of soldering or brazing. Proper boiler rivets should be procured, and annealed before use.
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