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Updated: May 17, 2025
"No," replied the man, "I will not, that is certain. And I mean to divide these playthings with you here." And so saying he applied a sudden and severe torsion to the lad's wrist. Harry could not suppress a scream, and the perspiration burst forth upon his face.
But a Russian physicist, M. Schwedoff, has gone further, and has been able by direct experiments to show that a sheath of liquid set between two solid cylinders tends, when one of the cylinders is subjected to a slight rotation, to return to its original position, and gives a measurable torsion to a thread upholding the cylinder. From the knowledge of this torsion the rigidity can be deduced.
"Why then firstly, lord, firstly we have the great Mangon or mangonel, fundis fundibula, that some do also term catapultum, the which worketh by torsion and shall heave you great stones of the bigness of a man fully two hundred yards an it be dry weather; next is the Trebuchet, like to the mangon save that it swingeth by counterpoise; next cometh the Balista or Springald that worketh by tension a pretty weapon! and shall shoot you dart or javelin so strong as shall transpierce you six lusty fellows at a time, hauberk and shield, like so many fowl upon a spit very sweet to behold, brother!
He will essentially promote the cause of science, and the cause of humanity, who will avail himself of the opportunity which country practice affords of putting the effect of torsion to the test: and few things will be more gratifying than the consciousness of rescuing our patients from the unnecessary infliction of torture.
In spite of the torsion torture, he had swung his free arm under the detective's lifted guard, not in Yokohama style but in the best manner of the old English prize ring, his clenched fist falling full on the point of the heart, full on the unguarded solar-plexus nerves which God put there for the undoing of the vainglorious fighters.
Q. How is the strength of a cast iron shaft to resist torsion determined?
The lateral equilibrium and the steering to right or left was to be attained by a peculiar torsion of the main surfaces, which was equivalent to presenting one end of the wings at a greater angle than the other. In the main frame a few changes were also made in the details of construction and trussing employed by Mr. Chanute.
It was a light frame of cork and bamboo, covered with paper, which formed two screws, driven in opposite directions by rubber bands under torsion. A toy so delicate lasted only a short time in the hands of small boys, but its memory was abiding. Several years later we began building these helicopteres for ourselves, making each one larger than that preceding.
For ordinary balances on the torsion system, in which extreme sensitiveness is not needed, the trouble caused by change of level of the scale is insignificant; but it becomes a matter of importance in more sensitive scales, such as fine analytical balances in places where it is impossible to keep the table or support of the scale level, for instance on shipboard.
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