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Updated: June 9, 2025
"It would only worry him and could do no good. You and I must work out this mess by ourselves." After dinner that evening Tom went to his private laboratory to check the thermostat controlling the temperature of the annealing oven in which his batch of new glass was being slowly cooled. Then he spent some time at his desk over certain intricate formulas.
The last annealing left the metal soft so that all this could be done, but too soft to work well as a pen; and it has to be heated red hot again, and then dropped into cold oil to harden it. Centrifugal force, which helps in so many manufactures, drives the oil away, and the pens are dried in sawdust. They are now sufficiently hard, but too brittle. They must be tempered.
With a forked stick he took the beaker from the ashes and placed it in the annealing oven. Giovanni watched him, and when the broad iron door was open, he saw the other pieces already standing inside on the iron tray. "Admirable!" cried Giovanni. "You are a great artist, my dear Zorzi! There is no one like you!"
All tubes are immersed in oil the second time, but at a temperature much below that to which they are raised at the first immersion. This process constitutes the annealing after tempering. The manufacture of steel-armor plates is a specialty of Le Creusot, which is engaged in an active competition with the manufacturers of compound armor.
If he cares enough to do so much, he ought to care enough to come and look on." "But he's in Europe, ain't he?" "What makes you think so, Dan?" "I asked Mr. Dalton, once, if he'd be here before we put in the new annealing furnace, just to see what he'd say, and he answered that he thought not. It would be a long time before young Early would reach these shores.
A spare figure darted into it, just ahead of the young man. From the threshold, the whole of the small interior was visible. The light came from a small annealing oven. At a table, overlaid with a thin slab of stone, a man was modeling a cat in clay. On the opposite side of the room was a younger man, painting an image, preparatory to burning it in the oven.
I next had specimen No. 4 cut from a fresh bar of iron which had never been used for anything. It also shows a crystalline fracture, indicating that this peculiarity had existed in the iron of both from the beginning. I next took specimen No. 3 and subjected it to a careful annealing, taking perhaps two hours in the operation.
Zorzi had taken very little at first, and he made of it a thin phial of graceful shape, turned the mouth outward, and dropped the little vessel into the bed of ashes. He would have set it in the annealing oven, but he wished to try the weight of it, and he let it cool. Taking it up when he could touch it safely, it felt in his hand like a thing of air.
"All that has to be done is to heat them again all to the same degree of heat, then let the oven cool at a certain rate. Here are the annealing ovens." "This is certainly a hot place," said the boy, as he stepped into the next building. "Whew! I wonder any one stays in here." "No one does," his conductor answered.
Pasquale, meanwhile, withdrew his feet from the old leathern slippers he wore, and noiselessly stole down the corridor and along the garden path, to find out what Giovanni was doing. When he came to the laboratory, he saw that the window was now shut, as well as the door, and that Giovanni had set the lamp on the floor behind the further end of the annealing oven.
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