Leonardo appears to have been left-handed.
Next he sought to prepare the inactive form of the acid by artificial means; and after great and long-continued labour he succeeded, and was led to the commencement of his classical researches on fermentation, by the observation that when the inactive acid was placed in contact with a special form of mould (Penicillium glaucum) the right-handed acid alone was destroyed, the left-handed variety remained unchanged.
The wire is subject to two superposed magnetizations, the one longitudinal, the other circular, due to the current traversing the wire; the resultant magnetization is consequently in the direction of a screw or spiral round the wire, which will be right-handed or left-handed according as the relation between the two magnetizations is right-handed or left-handed; the magnetic expansion or contraction of the metal along the spiral lines of magnetization produces the Wiedemann twist.
As a consequence of the structure of the molecule, which is an aggregation of atoms, the planes of the orbits around the latter may be oriented in various positions, and the direction of revolution may be right-handed or left-handed with respect to the direction of any applied magnetic field.
For those orbits whose projection upon a plane perpendicular to the field is righthanded, the period of revolution will be accelerated by the field (since the electron current is negative), and the magnetic moment consequently increased; for those which are left-handed, the period will be retarded and the moment diminished.
If the structure of the molecule is so perfectly symmetrical that, in the absence of any external field, the resultant magnetic moment of the circulating electrons is zero, then the application of a field, by accelerating the right-handed (negative) revolutions, and retarding those which are left-handed, will induce in the substance a resultant magnetization opposite in direction to the field itself; a body composed of such symmetrical molecules is therefore diamagnetic. If however the structure of the molecule is such that the electrons revolving around its atoms do not exactly cancel one another's effects, the molecule constitutes a little magnet, which under the influence of an external field will tend to set itself with its axis parallel to the field.
Abubekr's successor was Mahommed III., Ahmed ibn Ibrahim el-Ghazi (1507-1543), surnamed Gran (Granye), the left-handed.
In Germany "left-handed" or "morganatic" marriages were allowed by the Salic law between nobles and women of lower rank.
Some left-handed children may seem clumsy as they try to adapt to a right-handed world.
On one end also a right-handed, and on the other a left-handed, screw FIG.
Pasteur proved that the inactivity of the one acid depended upon the fact that it was composed of two isomeric constituents: one the ordinary or dextrorotary acid, and the other a new acid, which possessed an equally powerful left-handed action.
That's the way a left-handed person pours and Edith is the only lefty at Bird Song.
It is evidently a gyroscopic effect, being reversed in direction by a change from a right to a left-handed twist of rifling, and being increased by an increase of rotation of the shot.
about OA, OB, OC, respectively, is to leave the body in its original position, provided the circuit ABC is left-handed as seen from 0.
It appears also from (II) that the null-lines whose distance from the central axis is r are tangent lines to a system of helices of slope tan 1(r/k); and it is to be noticed that these helices are left-handed if the given wrench is righthanded, and vice versa.
Helical motion and screws adapted to it are said to be right- or left-handed according to the G appearance presented by the rotation to an observer looking towards the direction of the translation.
Hence the following principles: I If the screws are both right-handed or both left-handed, the angle between the directions of their axes is the sum of their obliquities;if one is right-handed and the other left-handed, that angle is the difference of their obliquities.
A couple is said to be right or left handed with reference to the observer, according to the direction in which it tends to turn the body, and is a driving couple or a resisting couple according as its tendency is with or against that of the actual rotation.
It is a curious feature that its noted slingers were said to be left-handed (Judg.
There is some doubt on the point; but a contemporary and intimate friend, Luca Pacioli, speaks of his "ineffable left hand"; all the best of his drawings are shaded downward from left to right, which would be the readiest way for a left-handed man; and his habitual eccentric practice of writing from right to left is much more likely to have been due to natural left-handedness than to any desire of mystery or concealment.
they are non-superposable, one being the mirror reflection of the other: they are left-handed and right-handed crystals respectively.
A ray of plane-polarized light traversing a right-handed crystal of quartz in the direction of the triad axis has its plane of polarization rotated to the right, while a left-handed crystal rotates it to the left.
Superimposed sections of rightand left-handed quartz, as may sometimes be present in sections of twinned crystals, exhibit Airy's spirals in the polariscope.
A peculiar rippled or "thumb-marked" fracture is sometimes to be seen, especially in amethyst, and is due to repeated intergrowths of rightand left-handed material.
4, shows a clutch for a rope-driven pulley A, which runs freely on a bush B on the shaft, and is provided with an enlarged cylindrical nave or clutch box C. A split ring D, carried by the clutch and turning with it, can be thrust against the clutch box by rightand left-handed screws E, so that a sufficient grip is obtained to cause the clutch and the pulley to turn as one piece.
The engagement of the pulley and clutch is determined by a hand-controlled block F sliding on the shaft, the movement of which is communicated to the rightand left-handed screw shafts by links G connected to the levers H.
The path of the extremity of the vector is then in general an ellipse, traversed in a right-handed direction to an observer receiving the light when a - (3 is between o and 7r, or between - 7r and - air, and in a left-handed direction if this angle be between 7r and 27, or between o and - 7r.
In crystals the rotary property appears to be sometimes inherent in the crystalline arrangement of the molecules, as it is lost on fusion or solution, and in several cases belongs to enantiomorphous crystals, the two correlated forms of which are the one right-handed and the other left-handed optically as well as crystallographically, this being necessarily the case if the property be retained when the crystal is fused or dissolved.
Fresnel showed that rotary polarization could be explained kinematically by supposing that a plane-polarized stream is resolved on entering an active medium into two oppositely circularly polarized streams propagated with different speeds, the rotation being rightor left-handed according as the rightor left-handed stream travels at the greater rate: The polarization-vector of the primitive - stream being = a cos nt, the first circularly polarized stream after traversing a distance z in the medium may be represented by = a cos (nt - k i z), ni = a sin (nt - kiz), and the second b z = a cos (nt - k 2 z), n2= - a sin (nt - k2z).
Since the two circular streams have different speeds, Fresnel argued that it would be possible to separate them by oblique refraction, and though the divergence is small, since the difference of their refractive indices in the case of quartz is only about o 00007, he succeeded by a suitable arrangement of alternately rightand left-handed prisms of quartz in resolving a plane-polarized stream into two distinct circularly polarized streams. A similar arrangement was used by Ernst v.
There is, however, a marked difference between this magnetic rotation and that of a structurally active medium, for in the latter it is always right-handed or always left-handed with respect to the direction of the ray, while in the former the sense of rotation is determined by the direction of magnetization and therefore remains the same though the ray be reversed.
In the second, the left-handed Shabana turned on his cross court backhand volley nick where Power found the tin.
left-handed opening batsman Godleman, who picked up a bat at the age of 10, could well be a part of that.
Figure 1: A right handed boomerang Step 1: Decide if you want a right- or left-handed boomerang.
conclusive answer to the question of why someone is left-handed.
I never associated " writer's cramp " with being left-handed.
Each strand is a left-handed helix twisted on itself, but the three strands are twisted into a larger right-handed triple helix.
helix clincher was the fact that the electron density maps revealed perfect left-handed helices.
The handwriting mat is A3 laminated card which is for left-handed chidlren on one side and for right-handed children on the reverse.
I have a son who is also left-handed and wanted to play guitar.
Contrary to oft quoted myth Jim Henson was not left-handed.
The Trio, David Kernan, Liz Robertson, and, Louise Gold are all left-handed.
Have a look at our range of fully left-handed items to see how we can help solve the problems.
He was made to wear splints to correct his knock-knees and was naturally left-handed but was forced to write with his right.
She was the only left-handed student in the class.
And he has, on 20, lost ideal position, played the pot left-handed and rattled it.
left-handed scissors by us for use at home.
left-handed opener loved putting away.
left-handed, heel or Tour center.
left-handed bread knife One of our most popular items.
Oh, isn't that cute, look at, he's playing left-handed.
He is now confined to a wheelchair and has had to learn to write left-handed as his right side and both legs are paralyzed.
He bowled left-handed, round-arm, " rather slow and twisting.
batting left-handed against right-handed people can be a challenge.
J Egan, the rider of All Of Me, reported that the colt hung left-handed.
I had the SAME teacher and mom insisted I stay left-handed.
left-handed in a right-handed world.
leftyalso has a great resource center full of left-handed information and a list of famous Australian lefties.
Bully on the other hand didn t, and continued to bowl a flurry of full tosses that their left-handed opener loved putting away.
Newman portrays notorious outlaw Billy the Kid in director Arthur Penn's first feature, " The Left-Handed Gun " (1958 ).
My parents were asked to provide me with left handed scissors for my use.
include left-handed scissors, 1 pair per six children with a minimum of 2 pairs for the group.
Both my children have been given left-handed scissors by us for use at home.
Confusion arises because some manufacturers make their " normal " knives serrated on the right of the blade - the left-handed side.
Lesley was first and chose a border spade, left handed secateurs and as she attracts rain her purple waterproof.
Amethyst is composed of an irregular superposition of alternate lamellae of right-handed and left-handed quartz.
As a result of this left-handed censure, a counter-demonstration was organized, led by Sir Bartle Frere, and a public address, signed by over 370,000 persons, was presented to Lord Milner expressing high appreciation of the services rendered by him in Africa to the crown and empire.
Thus in A the twist may be right-handed or left-handed; in B the polarity of a given end may become north or south; in C the circular magnetization may be clockwise or counter-clockwise; in D the length may be increased or diminished; in E the magnetization may become stronger or weaker.
Include left-handed scissors, 1 pair per six children with a minimum of 2 pairs for the group.
In this scenario, one would be right-handed and the other left-handed, or their natural hair part would be on the opposite side.
Beginner banjos come in right or left-handed models, so choose the one you are most comfortable with; there is no need to re-string a right-handed model to accommodate a lefty.
Beckley Scholarship: This award is designated for left-handed students.
There are 3 other settings you can choose from, but they're more suited for left-handed players.
The best way to do that is to move your player over four or five clicks (about the fourth line from the right or left, depending on if you're right- or left-handed.
If you are right-handed, move all the way to the right and turn slightly that way too (to the left if you are left-handed).
Although left-handed children usually are more flexible in their hand usage than right-handers, this may be because they are forced to function in a world designed for right-handers.
Other scientists believe that handedness should be measured on a continuum from completely right-handed to completely left-handed.
It is commonly estimated that about 10 percent of the human population is left-handed or ambidextrous.
Boys are about 1.5 times more likely than girls to be left-handed.
Archeological evidence indicates that the proportion of left-handed to right-handed people was about the same 30,000 years ago as it is in the early 2000s.
In the past there were many social and cultural biases against left-handed children.
In particular, left-handed children often were forced by parents or teachers to use their right hand for eating and writing.
Children of left-handed parents have a 50 percent chance of being right-handed and 18 percent of identical twins differ in their handedness.
Furthermore, right-handed twins are equally as likely as their left-handed twins to have left-handed children.
In the past left-handed children often were forced to write with their right hand.
Left-handed children may hook their wrists while writing in order to see the paper.
However, there is some evidence that left-handed people may be more at risk for schizophrenia, bipolar disorder, or language-processing disorders, including dyslexia and stuttering.
Left-handed children can become very frustrated when they are trying to imitate a right-handed parent or sibling, particularly with activities such as shoe-tying.
Teachers should help lefthanders to hold a pencil and place the paper in ways that are appropriate for left-handed writing.
Lefties: How to Raise Your Left-Handed Child in a Right-Handed World.
"The Left-Handed Child in a Right-Handed World."
"When Left Is Right: Left-Handed Toddlers."
About 20% of the time, one twin is left handed and the other is right handed.
In your opinion, are calligraphy styles more or less difficult to learn for left-handed crafters?
The word usage examples above have been gathered from various sources to reflect current and historial usage. They do not represent the opinions of YourDictionary.com.