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If too great shrinkage occurs, the place may be blown out gently after reheating. Thus the wire is sealed through the wall of the tube without changing the thickness of the latter, and consequently without developing undue stresses at that point. Such a joint must of course be carefully reheated and annealed.
"I hope I hope you're well," she stammered. "Very well, ma'am," said Jim, staring from her to his uncle. "And happy too?" "Yes, ma'am, I thank you." "Nothing that you crave for?" "Why, no, ma'am, I have all that I lack." "That will do, Jim," said his uncle, in a stern voice. "Blow up the forge again, for that shoe wants reheating."
The whole of the expanded joint is now heated as uniformly as may be until soft enough so that it begins to shrink a little, and the swelling is gently drawn down to the same diameter as the main tube, as in the first case. Any irregularities in the finished joint may be corrected by local reheating, shrinking or blowing as required.
If Beroviero had been watching him he would have been astonished at the skill with which the young man accomplished what it requires two persons to do; but Zorzi had tricks of his own, and the pontil supported itself on a board while he cracked the pear from the blow-pipe with a wet iron, as well as if a boy had held it in place for him; and then heating and reheating the piece, he fashioned it and cut it with tongs and shears, rolling the pontil on the flat arms of his stool with his left hand, and modelling the glass with his right, till at last he let it cool to its natural colour, holding it straight downward, and then swinging it slowly, so that it should fan itself in the air.
The moon was up. It shone obliquely down into all that rock-lined basin, surrounded by the stern, forbidding hills the ancient, burned-out furnace of gold that man was reheating with his passions. Afar in all directions the lighted tents presented a ghostly unreality, their canvas walls illumined by the candles glowing within. A jargon of dance-hall music floated on the air.
A suitable tube, having as near as possible the same diameter and wall strength as the one broken off, is selected and a piece the desired length cut off. If the break is very close to the stopcock, very little reheating and blowing can be done, on account of the danger of getting the stopcock sleeve out of shape, and the work must be heated very slowly to prevent cracking.
The assistant then brings him another bloom and takes the one that has been shingled to the reheating furnace, where he heats but one of its extremities. When the four blooms have been shingled, the workman takes up the first and begins to draw out one of its extremities, which he afterward cools in water and uses as a handle for finishing the work, d.
In order to prevent vibrations in the trip hammer when it is lifted, and increase the number of blows, there is established a spring beam, which is formed of unsquared timber, which is firmly fastened at one of its extremities, and which receives at the other end the shock of the hammer head when the latter reaches the end of its upward travel. Reheating Furnace.
Even good glass will begin to devitrify in this way if heated too long at the highest temperature of the flame, so care should always be taken to reduce the time of heating of any spot of glass to a minimum; i.e., get the desired result at the first attempt, if possible, or at least with the minimum of reheating and "doctoring," and avoid keeping the glass at the highest temperature of the flame any longer than necessary.
It may thus be toughened by slightly reheating the hardened steel; the resoftening course is indicated by certain prismatic tints, which appear in a peculiar order of succession on its surface.
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