The round cells were reproducibly positioned in the light beam which entered the thermostated mineral oil-bath through a window.

The sighting procedure includes the use of a fixture for the transit to project a beam of light, which is darkened by crossed hairs, on the accelerometer mirror.

At the instant of any observation of an object, the apparent position of the object is displaced from its true position by an amount which depends solely upon the transverse component of the velocity of the observer, with respect to the vector of the incoming beam of light ( i. e., the line actually taken by the light on its path to the observer ).

The light beam from a distant object cannot itself have any transverse velocity component, or it could not ( by definition ) be seen by the observer, since it would miss the observer.

Another way to state this is that the emitting object may have a transverse velocity with respect to the observer, but any light beam emitted from it which reaches the observer, cannot, for it must have been previously emitted in such a direction that its transverse component has been " corrected " for.

Such a beam must come " straight " to the observer along a line which connects the observer with the position of the object when it emitted the light.

For the simple case where the direction of the light beam along the line SE is perpendicular to the motion of the observer then only light emitted at an angle equal to the arc cosine of the ratio of the observer's speed to the speed of light will reach the telescope.

According to the special theory of relativity, the aberration looks as a transform of the celestial sphere due to different frames of reference and is virtually a special case of velocity addition, namely one of the light beam and frames ' relative velocity v. The formula from relativistic aberration can be simplified to

Laser Doppler anemometers use a beam of light from a laser that is divided into two beams, with one propagated out of the anemometer.

Particulates ( or deliberately introduced seed material ) flowing along with air molecules near where the beam exits reflect, or backscatter, the light back into a detector, where it is measured relative to the original laser beam.

At the regional cable television headend | headend, the TV channels are sent multiplexed on a light beam which travels through optical fiber trunklines, which fan out from distribution hubs to optical nodes in local communities.

At the headend the radio frequency electrical signal carrying all the channels is modulated on a light beam and sent through the fiber.

At the optical node, the light beam from the fiber is translated back to an electrical signal and carried by coaxial cable distribution lines on utility poles, from which cables branch out to subscriber residences.

The length over which the phase in a beam of light is correlated, is called the coherence length.

When looking at a cross section of a beam of light, the length over which the phase is correlated is called the transverse coherence length.

#* An infrared curtain or beam which shines invisible light onto sensors ; if someone or something blocks the beam the door is triggered open.

In the basic version of the experiment, a coherent light source such as a laser beam illuminates a thin plate pierced by two parallel slits, and the light passing through the slits is observed on a screen behind the plate.

However, one of the consequences of Einstein's theory is that there is no possible physical test that can distinguish between a beam of light as a model of a geometrical line and any other physical model.

The two horses broke from the yard, from the circle of light cast by the lamp still burning in the house, into the darkness.

A lantern hung from a peg, giving light.

It was, I felt, possible that they were men who, having received no tickets for that day, had remained in the hall, to sleep perhaps, in the corners farthest removed from the counter with its overhead light.

A match flared, and he reached above his head to light a lantern which hung from a wire loop.

They whirled and saw him, standing there dim in the slatted light from the boarded freight wall.

The distances of these points of light is a problem he cannot master, beyond crude conjectures as to the orderings of the planetary orbits viewed outward from earth.

In light of the scholarly reappraisals engendered by the higher criticism this is a most remarkable statement, particularly coming from one who was well known for his antifundamentalist views.

Far from being irrelevant to the ecumenical task, the Pontiff believes that a revivified Church is required in order that the whole world may see Catholicism in the best possible light.

But it also looked like a toad, hopping away from the light.

from the early evening lights of them which had first startled Izaak to look at her in an uncousinly way, they had faded to a near-absence of color which had, possibly from her constant looking at the water, something of the light of the sea in them.

At that time consideration will be given to whether in the light of the United States supplies of rice available for Title 1, disposal, India's production, consumption and stocks of food grains, other imports from the United States and countries friendly to the United States, India's storage capacity, and other related factors, any increase would be possible in the portion of the total rice programmed which is currently planned for procurement during the first year.

Essentially, the question presented for decision in the present Daytime Skywave proceeding is whether our decision ( in 1938-1939 ) to assign stations on the basis of daytime conditions from sunrise to sunset, is sound as a basis for AM allocations, or whether, in the light of later developments and new understanding, skywave transmission is of such significance during the hours immediately before sunset and after sunrise that this condition should be taken into account, and some stations required to afford protection to other stations during these hours.

It is a simple task to haul a boat fifty or one hundred miles to a lake or reservoir on the new, light, strong, easy-to-operate trailers which are built to accommodate almost any kind of small boat and retail from $100 to $2,000.

Then pour water or light oil from a graduated beaker into the chamber to fill the chamber to its gasket surface.

Just after sunset is a good time to record the city lights in color since you get a `` fill-in '' light from the sky.

( 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.

Also, the light sources are shielded from dirt and weather exposure and cannot obstruct the view of the sign.

Changes of intensity on the cell were achieved by use of a wire screen and by varying the distance of the light source from the cell.

Some 80 reaction tubes from 13 manifold fillings were illuminated in the temperature range from 40 to 85-degrees in a further endeavor to determine the cause of the irreproducibility and to obtain information on the activation energy and the effect of light intensity.

By comparing reaction cells sealed from the same manifold temperature dependency corresponding to activation energies ranging from 11 to 18 Af was observed while dependence on the first power of the light intensity seemed to be indicated in most cases.

In series 1, the relative light intensity was varied by varying the distance of the lamp from the reaction cell over the range from 14.7 to 29.2 cm..

Two types of light source were used, a thousand watt projection lamp and an AH6 high pressure mercury arc.

The last column shows the rate of exchange that would have been observed at a relative intensity of 4 ( 14.7 cm. distance ) calculated on the assumptions that the incident light intensity is inversely proportional to the square of the distance of the lamp from the cell and that the rate is directly proportional to the incident light intensity.

Using the strings that manipulate the puppet, suspend him from the light fixture by tying the strings to the lamp base.

A common application of the compounds of sodium is the sodium-vapour lamp, which emits very efficient light.

This is why an oil lamp is lit and kept beside the head of the corpse, to light the dark tunnel and allow the soul to travel comfortably.

To present a high-contrast display these models illuminated the LCD using a filament lamp and solid plastic light guide, which negated the low power consumption of the display.

** Gas-discharge lamp, a light bulb that includes a discharge gas

Arc lights had been used to produce special lighting effects in films like the light from a lamp or firelight before 1906, but this now became more common.

These same visible lines, accompanied by the emission lines of trivalent europium and trivalent terbium, and further accompanied by the emission continuum of divalent europium in the blue region, comprise the more discontinuous light emission of the modern trichromatic phosphor systems used in many compact fluorescent lamp and traditional lamps where better color rendition is a goal.

After electrophoresis the gel is illuminated with an ultraviolet lamp ( usually by placing it on a light box, while using protective gear to limit exposure to ultraviolet radiation ).

Ho < sub > 2 </ sub > O < sub > 3 </ sub >, left: natural light, right: fluorescent lamp light

Hyperbolae in the physical world: three cones of light of different widths and intensities are generated by a ( roughly ) downwards-pointing halogen lamp and its holder.

* The eternal light ( ner tamid ), a continually lit lamp or lantern used as a reminder of the constantly lit menorah of the Temple in Jerusalem

Later, the Gospel relates that Jesus regarded John as " a burning and shining lamp, and you were willing to rejoice for a while in his light " ( John 5: 35 ).

These types of lamps are still in use today in areas of the world without electricity, because they give a much better light than a simple wick-type lamp does ..

Pump light may be provided by a flash lamp or by another laser.

In a lighthouse, the source of light is called the " lamp " ( whether electric or fueled by oil ) and the concentration of the light is by the " lens " or " optic ".

Carbide was promoted by the Dalén light which automatically lit the lamp at nightfall and extinguished it at dawn.

Vertical light rays of the lamp are redirected into a horizontal plane, and horizontally the light is focused into one or a few directions at a time, with the light beam swept around.