Torsion sentence example
Grassot has devised a galvanometer, or " fluxmeter," which greatly alleviates the tedious operation of taking ballistic readings.2 The instrument is of the d'Arsonval type; its coil turns in a strong uniform field, and is suspended in such a manner that torsion is practically negligible, the swings of the coil being limited by damping influences, chiefly electromagnetic. The index therefore remains almost stationary at the limit of its deflection, and the deflection is approximately the same whether the change of induction occurs suddenly or gradually.
This change showing the points of insertion can brought about by arrest of the leaves and their spiral development, by increased development of individual parts or by a torsion of the axis.
In the Eschenhagen pattern instrument, in which a single quartz fibre is used for the suspension, two magnets are placed in the vicinity of the suspended magnet and are so arranged that their field partly neutralizes the earth's field; thus the torsion required to hold the magnet with its axis perpendicular to the earth's field is reduced, and the arrangement permits of the sensitiveness being altered by changing the position of the deflecting magnets.
At low temperatures, there is not enough thermal energy available to allow torsion angle changes, so the conformation becomes frozen in.
Soc., 1880, 30, p. 411, showing experiments on residual charge of condensers and a comparison between the behaviour of dielectrics and glass fibres under torsion.Advertisement
In the bud of the screw-pine the leaves are arranged in three orthostichies with the phyllotaxis but by torsion the developed leaves become arranged in three strong spiral rows running round the stem.
The driving circle is also much too small, so that a very slight mechanical freedom of the screw in the teeth involves a large angular freedom of the telescope in right ascension, while its position at the lower end of a too weak polar axis tends to create instability from torsion of that axis.
In this position the magnet is in equilibrium under the action of the torsion of the suspension and the couple exerted by the horizontal component, H, of the earth's field, this couple depending on the product of H into the magnetic moment, M, of the magnet.
Further, by suitably choosing the positions of the deflectors and the coefficient of torsion of the fibre, it is possible to make the temperature coefficient vanish.
The oouple may be due to the earths magnetism, or to the torsion of a suspending wire, or to a bifilar suspension.Advertisement
C. Greenhill treated the problem of the centrifugal whirling of an unloaded shaft with different supporting conditions in a paper On the Strength of Shafting exposed both to torsion and to end thrust, Proc. Inst.
Coulomb has made his name for ever famous by his invention and application of his torsion balance to the experimental verification of the fundamental law of electric attraction, in which, however, he was anticipated by Cavendish, namely, that the force of attraction between two small electrified spherical bodies varies as the product of their charges and inversely as the square of the distance of their centres.
The most important improvements in connexion with electrometers are due, however, to Lord Kelvin, who introduced the guard plate and used gravity or the torsion of a wire as a means for evaluating the electrical forces.
Matters are so arranged by giving a torsion to the wire carrying the aluminium disk F that for a certain potential difference between the plates H and G, the movable part F comes into a definite sighted position, which is observed by means of a small lens.
The upper end of the quartz fibre is rotated by a torsion head, and a metal cover serves to screen the instrument from stray electrostatic fields.Advertisement
He was the original inventor of the torsion balance, which afterwards became so famous in the hands of its second inventor Coulomb.
Penaud also substituted india-rubber under torsion for the whalebone and clock springs of the smaller models, and the steam of the larger ones.
Between the hook or crank (e) and the centre of the upper screw (a a), the indiarubber in a state of torsion (f) extends.
By fixing the lower screw and turning the upper, one a sufficient number of times the requisite degree of torsion and power is obtained.
The motive power was india-rubber in the condition of torsion; the propeller, a screw.Advertisement
A vertical movement having been communicated by means of india-rubber in a state of torsion to the roots of the wings, the wings themselves, in virtue of their elasticity, and because of the resistance experienced from the air, twisted and untwisted and formed reciprocating screws, precisely analogous to those originally described and figured by Pettigrew in 1867.
The torsion balance made by the United States Torsion Balance and Scale Company of New York is a counter machine made with - out knife-edges, and is very sensitive.
When the case which holds the machine is adjusted hori - zontally by means of its foot - screws, and the weights in the pans are equal, the beams remain perfectly horizontal; but with the slightest difference of weight in the pans the beams are tilted, and the elastic resistance of the springs to torsion allows the beams to take up a definite position of equi - librium.
It might be possible to prove the origin of all classes from Pelmatozoa, without thereby explaining the origin of such fundamental features as radial symmetry, the developmental metamorphosis, and the torsion that affects both gut and body-cavities during that process; but the acceptance of a Dipleurula as the common ancestor necessitates an explanation of these features.
The torsion angle ' n ' are defined in Table 1.Advertisement
Genu valgum, external tibial torsion and femoral anteversion increase the Q angle.
The small hydrogen side chain of the glycine amino acids permits the backbone torsion angles to adopt unusual conformations.
This involved changing from lever arm dampers with coil springs to telescopic dampers and torsion bars.
Late-onset primary torsion dystonia or focal dystonia is inherited in a more complex manner than the early-onset dystonia.
Boys may have a swollen scrotum, which in rare cases, can lead to twisting of the testis (testicular torsion ).
The post-war models, introduced in 1945, had striking styling and their specification included torsion bar front suspension and hydro-mechanical braking.
Cylinders - buckling under compression, bending, torsion with internal pressure, collapse under external pressure.
I had testicular torsion as a kid, which was sorted out very early and both testicles are still intact.
The Mangonel was an invaluable Medieval siege attack weapon, similar to a catapult which worked by using torsion or counterpoise.
Answer You were extremely fortunate to survive a testicular torsion with both intact.
There was a lot of debate over whether the method was really suitable for severe intractable clubfoot especially over the correction of tibial torsion.
The end result can be a fatal gastric torsion, caused by a food blockage.
This may be associated with an increased tibio-femoral ' Q ' angle and external tibial torsion.
A positive number should be used, indicating that the freezing of a rotatable torsion is unfavorable to ligand binding.
However, 1.5 Kcal/Mole for each restricted torsion is only the roughest of estimates as pointed out above.
Table III shows these core domain substitutions together with the backbone torsion angles of the parent structure.
If there is more than one side chain torsion (chi angle ), the these are all found.
In the larva there is no projection at the time the torsion takes place.
If A is the moment of inertia of the magnet, and t the time of a complete vibration, MH = 41r 2 A/t 2 (torsion being neglected).
The movable coil of the wattmeter is normally suspended so that its axis is at right angles to that of the fixed coil and is constrained by the torsion of a spiral spring.
When they are used for the propulsion of ships recourse is had to "torsion meters" which measure the amount of twist undergone by the propeller shafts while transmitting power.
Boys may have a swollen scrotum, which in rare cases, can lead to twisting of the testis (testicular torsion).
We diagnosed a left undescended testicular tumor and torsion of the left testis.
This is known as " torsion of the testicle ".
For the first time a damper unit was fitted to the torsion bar suspension, to aid in the ride comfort.
Late torsion bars are longer, thus give a softer ride.
These technical solutions offer a tripod with a unrivaled torsion rigidity with substantial weight saving comparing his competitors.
If there is more than one side chain torsion (chi angle), the these are all found.
However, it is not an easy task and unless you are confident dealing with electrical wiring, motors and torsion springs, it is probably better to hire a pro.
Since they are so heavy, garage doors work on torsion springs which work by twisting.
Testicular torsion is the twisting of a testis (testicle) such that the spermatic cord becomes twisted, cutting off blood flow to the testis.
There is approximately one case of testicular torsion in every 4,000 men under age 25 in the United States.
There are two times in life when torsion is most common, although it can occur at any age.
Testicular torsion is most common in the first year of life and during adolescence.
Torsion is more common in adolescents that it is in newborns.
Testicular torsion is caused by the rotating of the testicle is such a way that the blood flow to it is cut off.
Symptoms of testicular torsion are sudden severe pain in the scrotum, swelling and/or discoloration of the scrotum, nausea, and vomiting.
Approximately 40 percent of patients with testicular torsion reported having a similar pain sometime before, but at that time the pain resolved without treatment.
Testicular torsion is an emergency, and the child should be taken to the doctor or emergency room immediately if he shows the signs or symptoms of testicular torsion.
If the torsion occurs for less than six hours, there is a high chance the testicle can be saved.
If the torsion occurs for more than 24 hours, it is very unlikely that the testicle can be saved.
Torsion is indicated if the radioactive fluid does not flow through the sore testis.
Ultrasound scan accompanied by a contrast agent can also be used to diagnose testicular torsion.
Other diagnostic tests may be performed to help the doctor determine if torsion has occurred.
The other testicle is also secured during the surgery to prevent future testicular torsion, because children who have had one episode of testicular torsion are likely to experience it again.
Surgery is still necessary, however, even if blood flow to the testis has been restored, because it is very likely that torsion will occur again.
If the torsion is relieved within six hours, it is very likely that the testis will recover normal blood flow and function.
If the torsion continues for more than 24 hours, it is unlikely that the testis can be saved.
The only way to prevent torsion is to surgically anchor the testes so that they cannot move.
This is frequently done after an occurrence of torsion, both to the torsed testis and the unaffected testis.
Testicular torsion is usually very painful.
If the torsion is not corrected quickly, the testis usually loses function.
The first provides stiff anti pronation, anti supination and anti torsion (which basically means your foot is kept steady and cradled within the shoe).
He carried out a number of magnetic investigations which resulted in the discovery of many interesting phenomena, some of which have been rediscovered by others; they related among other things to the effect of mechanical strain on the magnetic properties of the magnetic metals, to the relation between the chemical composition of compound bodies and their magnetic properties, and to a curious parallelism between the laws of torsion and of magnetism.
The Gastropoda are mainly characterized by a loss of symmetry, produced by torsion of the visceral sac. This torsion may be resolved into two successive movements.
The problem of the causes of the torsion of the Gastropod body has been much discussed.
The pallial cavity, with its organs, is by this torsion moved up the right side of the larva to the dorsal surface, and thus the left organs become right and vice versa.
Neither the rotation of the shell as a whole nor its helicoid spiral coiling is the immediate cause of the torsion of the body in the individual, for the direction of the torsion is indicated in the segmentation of the ovum, in which there is a complete A B From Lankester's Treatise on Zoology.
In all these cases the torsion and asymmetry of the body are unaffected.
The characteristic torsion attains its maximum effect among the majority of the Streptoneura.
Comparative anatomy and embryology prove that this condition is due, not as formerly supposed to a difference in the relations of the visceral commissure which prevented it from being included in the torsion of the visceral hump, but to an actual detorsion which has taken place in evolution and is repeated to a great extent in individual development.
In several of the more primitive forms the same torsion occurs as in Streptoneura, viz.
These facts afford strong support to the hypothesis that the weight of the shell is the original cause of the torsion of the dorsal visceral mass in Gastropods.
He fully recognized, however, the similarity of Pteropods to Gastropods in their general asymmetry and in the torsion of the visceral mass in Limacinidae.
This second coil is suspended by a number of silk fibres, and to the coil is also attached a spiral spring the other end of which is fastened to a torsion head.
If then the torsion head is twisted, the suspended coil experiences a torque and is displaced through FIG.
F, Fixed coil; D, Movable coil; S, Spiral spring; T, Torsion head; MM, Mercury cups; I, Index needle.
This tendency can be resisted by giving a twist to the torsion head and so applying to the movable coil through the spring a restoring torque, which opposes the torque due to the dynamic action of the currents.
If then the torsion head is provided with an index needle, and also if the movable coil is provided with an indicating point, it is possible to measure the torsional angle through which the head must be twisted to bring the movable coil back to its zero position.
The instrument can be provided with a curve or table showing the current corresponding to each angular displacement of the torsion head.
It has the disadvantage of not being direct reading when made in the usual form, but can easily be converted into a direct reading instrument by appropriately dividing the scale over which the index of the torsion head moves.
Thus if the magnet is suspended horizontally by a fine wire, which, when the magnetic axis points north and south, is free from torsion, and if 0 is the angle through which the upper end of the wire must be twisted to make the magnet point east and west, then MH = CB, or M = C6/H, where C is the torsional couple for r 0.
To take a reading the torsion-head is turned until an aluminium pointer attached to the coil is brought to the zero position on a small scale; the strength of the field is then proportional to the angular torsion.
They relate almost entirely to electrical phenomena, such as the magnetic rotation of light, the action of gas batteries, the effects of torsion on magnetism, the polarization of electrodes, &c., sufficiently complete accounts of which are given in Wiedemann's Galvanismus.
In 1785 appeared his Recherches theoriques et experimentales sur la force de torsion et sur l'elasticite des fils de metal, &c. This memoir contained a description of different forms of his torsion balance, an instrument used by him with great success for the experimental investigation of the distribution of electricity on surfaces and of the laws of electrical and magnetic action, of the mathematical theory of which he may also be regarded as the founder.
A small circular disk at one end of a torsion arm formed part of a solid wall, but was free to move through a hole in the wall slightly larger than the disk.
Poynting may also be mentioned, in which the tangential component of the thrust of obliquely incident radiation is separately put in evidence, by the torsion produced in an arrangement which is not sensitive to the normal component or to the radiometer-pressure of the residual gas.
The movable coil of the wattmeter is normally suspended so that its axis is at right angles to that of the fixed coil, and is constrained by the torsion of a spiral spring.
When the currents flow through the two coils, forces are brought into action compelling the coils to set their axes in the same direction, and these forces can be opposed by another torque due to the control of a spiral spring regulated by moving a torsion head on the instrument.
Hence this power can be measured by the torsion which must be applied to the movable coil of the wattmeter to hold it in the normal position against the action of the forces tending to displace it.
This motion is resisted by the torsion of a spiral spring resembling the hair-spring of a watch having one end fixed to the coil axis, and there is therefore a definite position of the needle on the scale corresponding to each potential difference between the terminals, provided it is within the range of the control.
When making a determination of declination a brass plummet having the same weight as the magnet is first suspended in its place, and the torsion of the fibre is taken out.
For this reason some observers use a thin strip of phosphor bronze to suspend the magnet, considering that the absence of a variable torsion more than compensates for the increased difficulty in handling the more fragile metallic suspension.
The Calorimeter Was Suspended By A Steel Wire, The Torsion Of Which Made The Equilibrium Stable.
But at B there is no torsion, and no torsion couple of one part of the wire on the next.
The peculiarities of the Gastropoda are all due to the torsion of the shell and body.
But ultimately the coil becomes ventral or endogastric, in consequence of the second torsion movement then apparent.
One other effect of torsion remains to be noticed.
The chief uncertainty in declination observations, at any rate at a fixed observatory, lies in the variable torsion of the silk suspension, as it is found that, although the fibre may be entirely freed from torsion before beginning the declination observations, yet at the conclusion of these observations a considerable amount of torsion may have appeared.