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The result of this annealing process will be a smooth surface, fully equal to the brightness of pure copper. Let me add to this, as a finish to transatlantic matters, that a Mr Allan, at St Louis, having observed that in washing-machines only the linen on the outside of the heap was perfectly cleansed, has patented a new machine, which comprises a chamber or tub with a narrowed neck, in which a plunger is inserted; and this, 'with the clothes wrapped around it, passes through the narrowed neck of the chamber, and pressing forcibly on the water confined within, drives it violently through the body of the clothes, carrying the dirt with it.
Giovanni moved a step forward and spoke directly to one of the men who had just dropped a finished glass into the bed of soft wood ashes, to be taken to the annealing oven. "Stop working for a while," he said. "Let Zorzi have your place." "The foreman gives orders here, not you," answered the man coolly, and he prepared to begin another piece.
We regulate the oven according to what we are annealing in it. It does not take so long to anneal glass in a lehr as in a kiln, and therefore in many factories only lehrs are used. If you will come around to the cool end you can see some of the finished pieces being taken out. Each object is made by a certain set or gang of workmen a shop, we call it.
As he said the last words, the "crusader" hurried away in response to a call from one of the men. He resumed his carrying in of the red-hot bottles from the benches where the men had been molding them, to the annealing oven, and for a time Hamilton watched him. The work was a fearful strain. Sitting where he was, Hamilton could see all the way to the annealing oven.
Giovanni went to the other end of the annealing oven, and came back a moment later carrying the iron tray on which stood the pieces Zorzi had made on the previous morning. Beroviero looked at them critically, tried their weight, and noticed their transparency. "That is not my glass," he said in a tone of decision. "No," said Giovanni, "I saw that it was not your ordinary glass.
The red-hot bottles were carried in asbestos shovels, and these had to be kept fairly straight, imposing a terrific strain upon the back. In addition to this, the boys were compelled to face the furnace each time they came back, passing from the heat of the melting oven, in front of a draughty open door, to the heat of the annealing oven.
"I don't know yet," replied Craig, finishing the annealing. The black glassy substance was now a dull grey. "What's that stuff you were putting on the wire?" I asked. "Oh, just a by-product made in the manufacture of sulphuric acid," answered Kennedy airily, adding, as if to change the subject: "I want you to go with me to-night.
D. Counterpoise, By which the chill plate is tilted up The largest figure in the engraving is the annealing tub of cast iron filled with sawdust, where the speculum is placed to cool as slowly as possible.
The toughness of glass, i.e., its ability to withstand variations of temperature, depends on its composition and the care taken in its annealing. In general, large pieces of glass should be heated very slowly in the smoky flame, and the larger the diameter of the tube the greater the length which must be kept warm to prevent cracking.
For example, in winter they would cool more rapidly than in summer, and those near the door more quickly than those in the inner part of the forging house. That would make them of varying hardness. So, in order to make sure that they shall be the same, all those pieces you have seen being made are annealed." "How is the annealing done?" asked Hamilton. "That is simple enough," was the reply.
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