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Now it is very difficult to anneal glass, the trouble being that all hollow ware is one temperature on the inside and another on the outside. Hence, when heated, the inside takes longer to cool. Any current of cold air that strikes it will fracture it. So, as you can readily see, an annealing kiln or oven must be arranged in such a way that it will allow the two surfaces to cool simultaneously."
An army must go through the annealing process like glass; let a few regiments be cracked to pieces because their leaders did not know how to withdraw them gradually from the furnace of action, and the lesson will be all the better remembered because taught by a costly example.
On each side of the great room were the annealing ovens, and down the center of the hall on a track moved a casting table which rolled along on wheels. The pots of molten glass or metal were first taken from the furnaces and carried on trucks to this casting table. Here they were lifted by a crane, suspended above the table, and then tilted over, and the glass poured out.
As soon as a ball of red-hot glass had been collected on the end of a blow-pipe it was rushed off to the blower before it cooled. In and out of the throng of moving workmen young boys, or carriers, swung along bearing to the annealing ovens on charred wooden trays or forks newly completed vases or pitchers. Jean glanced about, fascinated by the bustling crowd.
"The lock is not very good," he said, "but I thought the box might keep the packet from dampness." "Is the packet properly sealed?" asked Zorzi, looking up. "You shall see," answered the master, and he set down the box beside the lamp, on the broad stone at the mouth of the annealing oven. "It is better that you should see for yourself."
I have a vision of a great building, where huge naval guns are being lowered from the annealing furnace above into the hardening oil-tank below, or where in the depths of a great pit, with lights and men moving at the bottom, I see as I stoop over the edge, a jacket being shrunk upon another similar monster, hanging perpendicularly below me.
"It is the result of the master's experiments." "It is marvellous! He has made another fortune." Giovanni replaced the specimen where it had lain, and as he did so, his eye fell on the phial Zorzi had made that morning. Zorzi had not put it into the annealing oven because it had been allowed to get quite cold, so that the annealing would have been imperfect.
Dalton was, in a sense, a self-made man, having begun as stoker of one of the annealing furnaces when both he and the Works were young. He had climbed steadily, serving his apprenticeship in each department, and studying at a night-school, when such were in operation, until the sudden demise of Mr.
There are many purposes for which a red heat is needed for slow continuous processes on a small scale, such as case-hardening small steel goods, annealing, heating light steel articles for hardening, and a great variety of other similar processes.
"The reason the edges have that blunted look is partly because they can't be struck as sharp as they can be ground, and then being heated in the glory-holes, and again in the leers softens them down a little. In fact, the very idea of annealing is to make the outside particles of the glass run together just a very little, so as to fill up the pores as it were, and make a smoother surface.
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