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The making of such pens is rather a tedious business, but if care be taken of the pen when made it will last an indefinite time. Tubing 3/16 or 1/8 inch in external diameter is suitable. Take a piece and hold its centre in the flame of a small spirit lamp, and revolve it till it softens. Then draw the glass out in as straight a line as possible, so that the points may be central.
Next bevel off a piece of tubing to an angle of 45 degrees, cutting off roughly in the first instance and finishing up carefully with a file till the angle is exact. Solder to the end a piece of tin, and cut and file this to the precise shape of the elliptical end. Detach by heating, scribe a line along its longest axis, and attach it by a small countersunk screw to the end of a convenient handle.
Solid-drawn tubing is more expensive than welded tubing or an equivalent amount of sheet metal, but is considerably stronger than the best riveted tube. Boiler ends may be purchased ready turned to size. Get stampings rather than castings, as the first are more homogeneous, and therefore can be somewhat lighter. Flanging Boiler Ends.
As a result, during the five or six minutes required to "spot in" the caboose, and an extra minute or two lost while the brakeman struggled with the recalcitrant lock on the switch, the air had leaked away through the worn valves and rubber tubing, and the brakes had been released so that the train, without warning, had quietly and almost noiselessly slid out of the log-landing and started on its mad career.
When such tubing is worked, the walls of these microscopic tubes collapse in spots, and the air thus enclosed will often collect as a small bubble in the wall, thus weakening it. Irregularities are of various kinds. Some of the larger sizes of thin-walled tubing often have one half of their walls much thicker than the other, and such tubing should only be used for the simplest work.
The barrel is a length of brass tubing; the plunger a piece of brass or preferably gun-metal rod, which fits the tube closely, but works easily in it. The gland at the top of the barrel, E, is composed of a piece, D, of the same tubing as the barrel, sliding in a collar, C, soldered to E. The bottom of D and top of E are bevelled to force the packing against the plunger.
It was a bar of iron at least four inches in circumference, and incased in a length of rubber tubing, which was tied tightly over each end. 'That, said he, 'is the weapon, and if it had struck you fairly, it would have been your death. I held it in my hand. A death-dealing weapon indeed, and I shuddered as I put it down, asking myself meanwhile, 'Was it meant for me?
I believe the cable must have gone at any rate; however, since it went in my watch and since I might have secured the tubing more strongly, I feel rather sad. . . . 'June 28.
The impact of the long steel tubing directly upon the shell of the mine was sufficient to explode the deadly thing. A terrific detonation rent the air and immediately a column of water was hurled high, towering over the Dewey like a geyser, and then engulfing the little submarine. Jack and his commander were swept off their feet in the deluge.
The hair is clipped over five or six or more circular areas of about an inch in diameter; the skin is cleansed and then painted with tincture of iodin. A long heavy sterile needle, which is connected with an oxygen tank by means of six feet of rubber tubing, is thrust into the depths of the affected muscles and the gas is gently introduced into the tissues.
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