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In making glass to be used for mirrors, a considerable portion of sodium sulphate is used, and in annealing, this is partly reduced to sodium sulphide, which effloresces on the surface of the glass.
The sunlight streamed through a window high above the floor and fell upon the arched back of the annealing oven, the window being so placed that the sun could never shine upon the working end and dazzle the workmen. When Giovanni and Zorzi entered, the men were working in silence.
On a table behind her a single rose hung over the edge of a tall glass with a slender stem, almost the counterpart of the one in which Contarini had drunk her health at midnight. Her father had given it to her as it came from the annealing oven, still warm after long hours of cooling with many others like it.
The great strides made in the manufacture and forging of steel during the past quarter of a century, the improved tempering and annealing processes have resulted in the turning out of big guns solely composed of steel.
Small moving parts are made as light as possible, but rigidity is secured by the free use of strengthening ribs. Many of the parts are of cast iron, rendered malleable by annealing, and finally casehardened. Such parts are found to be quite as durable as if made of forged steel, and are, of course, less costly.
Manufacturers of electro-magnets for telegraphic instruments are very careful to choose the softest iron and thoroughly anneal it; but very few recognize the importance as regards the position of the iron while annealing it under the earth's directing influence. The fact, however, has long since been observed. Dr.
It sometimes happens when the varnish is not very good that by repeated washing the gold wears off; on this account the practice of burning it in is sometimes had recourse to; for this purpose some gold powder is ground with borax, and in this state applied to the clean surface of the glass by a camel hair pencil; when quite dry the glass is put into a stove, heated to about the temperature of an annealing oven, the gum burns off; and the borax, by vitrifying, cements the gold with great firmness to the glass, after which it may be burnished.
This was accomplished by drawing the disc of metal as soon as it had entered into the solid state, though still glowing red, into an annealing oven. There the temperature was allowed to subside so gradually, that six weeks elapsed before the mirror had reached the temperature of the external air.
When he judged that he had taken out more than half the contents, he took the iron box from the annealing oven. It was hard to carry it under the arm by which he walked with a stick, the other hand being necessary to move the crutch, and as he reached the jar he felt that it was slipping. He bent forward and it fell with a crash, bedding itself in the smashed glass.
Have the crystals been obliterated by the process of annealing, or has only their cleavage been destroyed, so that when they break, instead of showing brilliant, sparkling faces, they are drawn into a fibrous looking mass? The latter seems to be the most plausible theory, to which I admit objections may be raised.
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