A primitive form of frictional machine was invented around 1663 by Otto von Guericke, using a sulphur globe that could be rotated and rubbed by hand.

Pasteur separated the left and right crystal shapes from each other to form two piles of crystals: in solution one form rotated light to the left, the other to the right, while an Racemic mixture | equal mixture of the two forms canceled each other's effect, and does not rotate the polarized light.

Euler rotations are never expressed in terms of the external frame, or in terms of the co-moving rotated body frame, but in a mixture.

Euler rotations are never expressed in terms of the external frame, or in terms of the co-moving rotated body frame, but in a mixture.

When a vessel ( typically a tube or bottle ) containing a mixture of proteins or other particulate matter, such as bacterial cells, is rotated at high speeds, the angular momentum yields an outward force to each particle that is proportional to its mass.

The pilot's chamber contains firing, starting and gyroscope starting switches as well as a fixed periscope that could only be rotated but not raised or lowered, the rudder control, trim gauge and a sodium peroxide tin for air purification.

H is at top, its left vertical stroke starting the common vertical line ; K is below, with its vertical stroke continuing the common vertical line ; and the letters V and R sit at the bottom: the V is rotated slightly counter-clockwise so its right stroke continues the common vertical line while the vertical stroke of the R also shares this part of the common vertical line.

While the basic format of the original rally remained, two important things changed: to ensure the quality of the event, the rally is run every other year, and the starting and ending points are rotated to different locations within the United States.

During that season, Kitna and Huard rotated as starting QBs due to injury and benchings.

Once all discs and the dial are rotating together, the dial is rotated until the last disc is in place and the notch is in the proper positioning, then by rotating the dial in the other direction, the catches will all disconnect, starting from the dial to the first disc and so on until they connect from the other side and the discs begin to rotate together by the same method but in the opposite direction.

In the complete expression, the head is swept to one side, nose rotated through a 90 ° arc to midline, then rapidly returned to the starting position.

With a wealth of returning talent, Guthridge instituted a " six starters " system, whereby the team's top six players, Antawn Jamison, Vince Carter, Ed Cota, Shammond Williams, Ademola Okulaja and Makhtar N ' Diaye rotated positions in the starting five.

This policy means that players in the squad are rotated into and out of the starting team resulting in consecutive matches in the All Blacks 2005 Grand Slam fielding entirely different starting fifteens.

( Note: Because of light leakage from one ultraviolet source to another, the lights are switched by a commutator-like assembly rotated by a synchronous motor.

The sample is spotted at one corner of a square plate, developed, air-dried, then rotated by 90 ° and usually redeveloped in a second solvent system.

The Luttrell Psalter, dating to around 1340, describes a grindstone rotated by two cranks, one at each end of its axle ; the geared hand-mill, operated either with one or two cranks, appeared later in the 15th century ;

Therefore, looking at an image of oneself with the front / back axis flipped is the same as looking at an image with the left / right axis flipped and the whole figure rotated 180 degrees about the vertical axis, which is exactly what one sees when standing in front of a mirror.

In many traditional and organic farming practices, fields are rotated through various types of crops, which usually includes one consisting mainly or entirely of clover or buckwheat ( non-legume family Polygonaceae ), which are often referred to as " green manure ".

Eysenck, along with another contemporary in trait psychology named J. P. Guilford ( 1959 ), believed that the resultant trait factors obtained from factor analysis should be statistically independent of one another — that is, the factors should be arranged ( rotated ) so that they are uncorrelated or orthogonal ( at right angles ) to one another.

This arrangement was less than perfect, as a particle on the inner portion at one end would not end up at the outer portion at the other, but at some other point rotated from the perfect location due to the tilt of the two ends.

J and L are the same tetracube, as are S and Z, because one may be rotated around an axis parallel to the tetromino's plane to form the other.

When a subtree is rotated, the subtree side upon which it is rotated decreases its height by one node while the other subtree increases its height.

In other words, if the reference axes were rotated in one direction, the component representation of the vector would rotate in exactly the opposite way.

A plane may be obtained by condensation ( from a line rotated around one of its ends ).

As MAD Magazine pointed out on its cover for the March 1961 issue, this was the first " upside-up " year — i. e., one in which the numerals that form the year look the same as when the numerals are rotated upside down — since 1881.

Note the factors of two before ψ and χ corresponding respectively to the facts that any polarization ellipse is indistinguishable from one rotated by 180 °, or one with the semi-axis lengths swapped accompanied by a 90 ° rotation.

However, it should be noted that Huygens used this form of spring initially only because the balance in his first watch rotated more than one and a half turns.

Of the Heeren XVII, eight delegates were from the Chamber of Amsterdam ( one short of a majority on its own ), four from the Chamber of Zeeland, and one from each of the smaller Chambers, while the seventeenth seat was alternatively from the Chamber of Zeeland or rotated among the five small Chambers.

# Lottery: During the year, the twenty-four priestly watches or divisions rotated through responsibility for conducting the Temple services, one week per watch.

This ring is put into position and rotated so that one page falls each minute, showing a new number for the minutes.

An echelle spectrograph uses two diffraction gratings, rotated 90 degrees with respect to each other and placed close to one another.

The set of intersections of Af, the rotated curve, with the original curve C consists of just the set of forward corner points on C corresponding to the vertex at Af, plus the vertex itself.

The red bordure is charged with seven yellow castles: three on the chief portion ( one in each corner and one in the middle ), two in the middle points of each quadrant of the curved base ( rotated 45 degrees ), and two more on each side of the bordure, over the flag's horizontal middle line.

There are four wheels, one at each corner of the puzzle, each allowing the corresponding corner clock to be rotated directly.

The movement seems to be rotated counter-clockwise from the upper left to the lower right corner to move, where the gradient of the apparently frozen sequence corresponding to the bottom right to top left dark, respectively, becomes more transparent, the fading of which is apparently intended to simulate the " older " section.

The following equation on the polar coordinates ( r, θ ) describes a general ellipse with semidiameters a and b, centered at a point ( r < sub > 0 </ sub >, θ < sub > 0 </ sub >), with the a axis rotated by φ relative to the polar axis:

Rotation matrices depend on the axis around which a point is to be rotated.

Angular displacement of a body is the angle in radians ( degrees, revolutions ) through which a point or line has been rotated in a specified sense about a specified axis.

Then, the markedness of the ruler comes into play: it is " anchored " at point A, and slided and rotated until one mark is at point C, and one at point D, i. e., CD = AB.

It can be confused with sunset, which is the point at which the earth has rotated enough that the sun is no longer visible from the local horizon.

In the northern hemisphere, if the watch is rotated so that the hour hand points toward the Sun, the point halfway between the hour hand and 12 o ' clock will indicate south.

Still another variant has a detachable bell easily rotated to point in the direction of the player's choice.

The point value of the trick is based on time maintained, degrees rotated, number of tricks performed in sequence, and the amount of times the tricks have been used ( the more often a trick is used, the less it's worth ).

In the active transformation ( left ), point P moves relative to the coordinate frame to location P ', while the coordinate frame remains unchanged ( in this case, the position of P has rotated clockwise by angle θ ), while in a passive transformation ( right ), point P is observed in two different coordinate frames ( pictured rotated relative to one another by angle θ ) The coordinates of P ' in the active case are the same as the coordinates of P in the rotated frame in the passive case if the rotation of P is clockwise and the rotation of the axes is counterclockwise.

To prepare for the recovery phase, the hand is rotated so that the palms point towards the legs and the thumb side points upwards.

A rotated square is drawn using two-point perspective, with each set of parallel lines leading to a different vanishing point.

To carry out a rotation using matrices the point ( x, y ) to be rotated is written as a vector, then multiplied by a matrix calculated from the angle,, like so:

Prior to SMAP's official debut in 1991, the group's lineup continuously rotated and, at one point, even included future V6 leader Masayuki Sakamoto and future Tokio member Taichi Kokubun.

An image travelling through a Porro prism is rotated by 180 ° and exits in the opposite direction offset from its entrance point.

The lid of the now opened can is lifted, most often with the P-38 cutting edge, and the P-38 is wiped clean, and the cutting point is rotated back to its stowed, folded position ; then, the P-38 is returned to its stored location, whether that is dangling on a dog tag chain around one's neck, or in one's pocket if the P-38 is attached to a key ring.

This was done in a fashion similar to carrier-based aircraft ; the wings were hinged at a point about 50 % along the span, with the outer portions rotated back toward the body of the missile.