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In this case the blowpipe is simply fixed with the nozzle six inches above the coke, and the flame directed downward. As soon as the coke shows red, the gas pipe is pinched so as to blow the flame out, and the mixture of gas and air is blown from above into the coke as before. With this and a little practice, you can get a weld on a 7/8 inch round bar in 10 minutes.
A month ago they settled the immortality of the soul, and the other night, returning to their former subject, the question came up: "What will become of Red Martin when he goes to Heaven?" Dan contended that the poor fellow is carrying around his own little blowpipe hell as he goes through life.
This is a metal which resists the action of acids, resists oxidation by heat, and change of any sort; and which, therefore, I may heat in the atmosphere without any flux. I bend the wire so as to make the ends cross: these I make hot by means of the blowpipe, and then, by giving them a tap with a hammer, I shall make them into one piece.
"For, my senses! they're no stray lambs o' tenderfoot those 'twa bit lassies'!" mimicking Andrew's blowpipe. "They know how to take care of themselves in a pinch and of somebody else, too!... And and, see here, what I've brought you, honey, rolled in the blanket for him!" "Cake choc'late cake! C-coffee!" Una gasped feebly, confronted by the ghost of her everyday life.
The objections against the volcanic origin of obsidians, founded on their speedy loss of colour, and their swelling by a slow fire, have been shaken by the ingenious experiments of Sir James Hall. I applied the blowpipe to some black pumice-stone from the volcano of the isle of Bourbon, which, on the slightest contact with the flame, whitened and melted into an enamel.
I will now, with a blowpipe and small foot blower, heat a short length of locomotive boiler tube to a brazing heat on the table; and, in conclusion, will convert the table into a small foundry.
Some of the masses are as white as quicklime, and appear absolutely pure; but on examining them with a lens, minute particles of scoriae can always be seen, and I could find none which, when dissolved in acids, did not leave a residue of this nature. It is, moreover, difficult to find a particle of the lime which does not change colour under the blowpipe, most of them even becoming glazed.
I shall be able to show you the difference in temperature obtained in a furnace by an ordinary air blast, by a blowpipe flame directed into the furnace, and by the same mixture of gas and air which I use in the blowpipe being blown in and burnt in contact with the ignited coke.
"Acetylene, as you may know," he hastily explained, never pausing for a moment in his work, "is composed of carbon and hydrogen. As it burns at the end of the nozzle it is broken into carbon and hydrogen the carbon gives the high temperature, and the hydrogen forms a cone that protects the end of the blowpipe from being itself burnt up." "But isn't it dangerous?"
Iris obeyed him, with wonder in her eyes. He spilled a teasponful of champagne into a small hollow of the rock and steeped one of the fish-bones in the liquid. Within a few seconds the champagne assumed a greenish tinge and the bone became white. Then he knew. "Good Heavens!" he exclaimed, "these are poisoned arrows shot through a blowpipe.
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