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Updated: May 9, 2025
Some ten feet below this and an equal distance from the ground the tendrils of the eva-eva vine had been led from tree to tree, the subordinate fibres and palpitating feelers quickly knitting themselves into a floor with all the hygienic properties and tensile strength of linen-mesh.
Multipoly plastic is a substance as anomalous as its name. It is a multiple polymer of something-or-other which stretches very accommodatingly to a surprising expanse, and then suddenly stops stretching. When it stops, it has a high and obstinate tensile strength. All ships carry it for temporary repairs, because it will seal off anything. A one-mill thickness will hold fifteen pounds pressure.
"Well, we run the gauntlet, presented every block with stuff rangin' in tensile strength from insults to asphalt pavements, and noise! say, all the racket in the world was a whisper. I caught a glimpse of the old man leanin' out of the pilot house, where a window had been, his white hair bristly, and his nostrils h'isted, embellishin' the air with surprisin' flights of gleeful profanity.
A. If we take the tensile strength of cast iron at 15,000 lbs. per square inch, a fly-wheel rim of one square inch of sectional area would sustain 30,000 lbs. If we suppose one half of the rim to be so fixed to the shaft as to be incapable of detachment, then the centrifugal force of the other half of the rim at the moment of rupture must be equal to 30,000 lbs.
The more intrepid intelligence, the more versatile energy, amid which we live, have achieved the success of combining the two: so that while it is true now, as of old, that "no mattock plunges a golden edge into the ground, and no nail drives a silver point into the plank," it is also true that, under the stimulus of the larger expenditure which the added supplies of gold make possible, the duller metal has taken a fineness, a brightness and hardness, with a tensile strength, before unfamiliar.
The native courage of the man must be tempered, ground and polished. On land it is the massing of numbers that accomplishes the result the accumulation of vital forces and intelligence upon the objective point. The innumerable threads of individual enterprise, like the twist of a Manton barrel, give the toughest tensile power.
In locomotive boilers the strain of 4000 lbs. per square inch of section is sometimes exceeded by nearly one half; but such an excess of strain approaches the limits of danger. Q. Will you explain in what way the various strains subsisting in a steam engine may be resolved into tensile and crushing strains; also in what way the magnitude of those strains may be determined?
But suppose the stone is eight thousand miles in diameter, the string ninety-two million five hundred thousand miles long, and the swiftness one thousand miles a minute, what needs be the tensile strength of the string?
But the new neighborly element will be found, we must believe, as an element has been found for the strengthening of steel. I was told by a chemist, when visiting the mills in Pittsburgh, that every steelmaker knows that a little titanium mixed with the molten iron after its boiling in air multiplies its tensile strength immeasurably, though no one knows just why it is so.
Lacking the impression of pure force, of sheer power, he seemed to express the capacity for larger endurance, of better staying qualities, of greater tensile strength. He was cast in another mould, a weapon of a different pattern. Farwell might be compared to a battle-axe; Dunne to a rapier.
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