All chlorophyll plants require light, but in very different degrees, as exemplified even in the United Kingdom by the shade-bearing beech and yew contrasted with the light-demanding larch and birch; and as with temperature so with light, every plant and even every organ has its optimum of illumination.

In the 18th century " Illumination " - an age which piqued itself upon its " enlightenment, " and " Ilium!- which did a good deal to drive away obscurity, though at the cost of losing depth - Deism outside the churches is matched by a spirit of cool common-sense within them, a spirit which is not confined to professed Rationalists.

For the illumination of large stations by night electric arc lamps are frequently employed, but some authorities favour high-pressure incandescent gas-lighting.

That baptism is called the Seal (vdpa'yls), and Illumination (4ceno-phs) in the 2nd century has been set down to the influence of the pagan mysteries; but as a matter of fact the former term is a metaphor from military discipline, and the idea conveyed in the latter that gnosis or imparting of divine love is an illumining of the soul is found both in the Old and New Testaments.

Owing to the variable illumination of the selenium thus produced, the resistance of the latter, and therefore the intensity of the current sent through the line to the receiving station by the battery, will be altered accordingly.

Intermittent illumination, however, with frequency equal to that of the fork shows at once that the jet is really broken up into drops, one for each vibration, and that these move over in a steady procession.

If the slit is of 'constant width and we require the illumination at various points on the screen behind it, we must regard the arc of the curve as of constant length.

Neoplatonism owes its form to Plato, but its underlying motive is the widespread feeling of self-despair and the longing for divine illumination characteristic of the age in which it appears.

In the events which ended in the emancipation of the A erican colonies from the monarchy, Burke's political genius shonwith an effulgence that was worthy of the great affairs over w ich it shed so magnificent an illumination.

After this so rapid was the progress of this new mode of illumination that in the course of a few years it was adopted by all the of gas principal towns in the United Kingdom for lighting streets as well as shops and public edifices.

A very marked diminution in illumination occurs, however, when the exit pupil of the instrument is smaller than the pupil of the eye.

While some forms of poetry have free rein with regard to their subject or number of lines and syllables, the haiku was established in Japan as far back as the 9th century with a specific structure, style, and philosophy. Many poets still write in the original 5-7-5 syllable pattern and follow the traditional rules for writing haiku.

At the burning of Moscow, he declared afterwards, his own soul had found illumination, and he had realized once for all the divine revelation to him of his mission as the peacemaker of Europe.

When light passes through a small circular or annular aperture, the illumination at any point along the axis depends upon the precise relation between the aperture and the distance from it at which the point is taken.

Before you make a decision, take a look at a few standard and low voltage track lighting systems at your retailer to get an idea of how the illumination will work in your space.

If a growing stem receives stronger illumination on one side than another, its apex slowly turns from the vertical in the direction of the light source, continuing its change of position until it is in a direct line with the incident rays.

Illuminationlighting meaning

The divisions of both drums are conveniently read, simultaneously, by the lens e; at night the lamp which illuminates the webs and the position-circle also illuminates the drum-heads (see on illumination p. 385).

The men in question claimed to be Christians and to enjoy divine illumination as truly as anybody, and so other safeguards appeared necessary.

It may be helpful to adjust the illuminating mirror and point the illumination system slightly higher or lower than center.

Under artificial illumination many sapphires appear dark and inky, whilst in some cases the blue changes to a violet, so that the sapphire seems to be transformed to an amethyst.

In this case also the illumination must fall to zero by the vignetting of the pencils coming from objects at the margin of the field of view.

In dark field illumination care has to be taken that no direct rays reach the objective, and hence a good dark field illumination can be produced if the condenser system has a larger aperture than the objective.

If r, or z, be infinite, Jo(z), J 1 (z) vanish, and the whole illumination is expressed by 71-R 2, in accordance with the general principle.

What isilluminationin the Bible

Whatever this increased illumination may be, it can be precisely imitated by removing the mirror and placing a second lighted candle at the place occupied by the optical image of the first candle in the mirror, that is, as far behind the plane as the first candle was in front.

From operating altitudes of up to 1000 feet, the searchlight beam can be adjusted to provide illumination over a wide area.

The imperial crown symbolizes the transcendent illumination or light of the 8th degree, the one that embraces and governs everything else.

This is specially designed for viewing an entire 35mm slide or negative frame, this 8x loupe has a clear base for shadowless illumination.

But the question still remains open whether these variations may not be due wholly to the different phases of illumination by the sunlight as the latter strikes the region from various directions.

There were arrangements for the brilliant illumination of the choir and its relief, which was sometimes sculptured on both sides and reversible, while the podia were intentionally more obscure.

In view of his probable accession to power, preparations were made in the city of London for a banquet and a general illumination to celebrate the event.

If the obliquity of illumination be so great that the principal maximum passes through the outermost edge of the objective, while a spectrum of 1st order passes the opposite edge, so that in the back focal plane the diffraction phenomenon shown in fig.

The moon reflects the light from the sun and astrologically symbolizes an inner illumination of your deepest and most private thoughts.

The advanced illumination sensor and built-in lights make it possible to take quality photos even when the light conditions are not ideal.

For lenses of short focus the diameter of the pupil is too large, and diaphragms must be employed which strongly diminish the aperture of the pencils, and so reduce the errors, but with a falling off of illumination.

The electric lamp a gives illumination of the webs in a dark field, nearly in the manner described for the Cape transit circle micrometer; the intensity of illumination is regulated by a carbon-resistance controlled by the screw b.

It is this daring faith in divine illumination that brings the Zwickau teachers most nearly into touch with the Anabaptists.

By means of this " light-relay " the intensity of the light acting at any moment upon the sensitized paper is made proportional to the illumination of the selenium in the transmitter.

Window candles that plug in or run on batteries are a great extension of your outdoor holiday lights, offering additional outside illumination while bringing their warm glow indoors as well.

Sometimes a Holtz machine was employed, but even without it illumination resembling aurora was seen on several occasions, extending apparently to a considerable height.

Illuminationof light formula

The city has gas and electric illumination, street and suburban railways, drainage and a public water supply drawn from a small tributary of the Beberibe about 7 m.

The most constantly occurring changes that beset a plant are connected with illumination, temperature, moisture, and contact with foreign bodies.

Ceiling lights not only cast a wider expanse of illumination than floor lamps, but also complement the architectural features of a home and the interior design.

Expressions suitable for discussion when v is large were obtained 1 In experiment a line of light is sometimes substituted for a point in order to increase the illumination.

They do not see that the role of the natural sciences in this matter is merely to serve as an instrument for the illumination of one side of it.

This was first suggested by Thomas Young, who showed that the rays producing the bows consisted of two systems, which, although emerging in parallel directions, traversed different paths in the drop. Destructive interference between these superposed rays will therefore occur, and, instead of a continuous maximum illumination in the direction of minimum deviation, we should expect to find alternations of brightness and darkness.

The design allowed the light to be swiveled to focus the illumination in a variety of directions, making the lamp extremely functional as a desk lamp.

He dwelt upon the illumination of the mind and soul by direct communion with the Creative Spirit; upon the spiritual and poetic monitions of external nature; and upon the benefit to man of a serene mood and a simple way of life.

On either side of any one of them the illumination is distributed according to the same law as for the central image (m = o), vanishing, for example, when the retardation amounts to (mn t 1)X.

If the eye, provided if necessary with a perforated plate in order to reduce the aperture, be situated inside the shadow at a place where the illumination is still sensible, and be focused upon the diffracting edge, the light which it receives will appear to come from the neighbourhood of the edge, and will present the effect of a silver lining.

The word usage examples above have been gathered from various sources to reflect current and historical usage. They do not represent the opinions of YourDictionary.com.

The mountainous configuration of the moon's surface was there first described, and the so-called "phosphorescence" of the dark portion of our satellite attributed to its true cause--namely, illumination by sunlight reflected from the earth.

The nozzles of small lamps are inserted in the tubes L, L, for illuminating the webs in a dark field; the light from these lamps is admitted through apertures in the strong hollow cylinder above mentioned (for illumination, see p. 385).

Using two lamps, two color wheels and dual illumination channeling, the F3 achieves up to 5500 ANSI lumens brightness on screen.

As a distinct movement Pietism had run its course before the middle of the 18th century; by its very individualism it had helped to prepare the way for another great movement, the Illumination (Aufklarung), which was now to lead the world into new paths.

Military night vision goggles are meant to take the place of artificial illumination and fire when nighttime combat or military applications are necessary.

When the decision was known the populace, who had been eagerly waiting from early morning till night to hear the result, accompanied the members with torches and censers to their lodgings, and there was a general illumination of the city.

Keep in mind that these lights are supposed to offer a subtle amount of illumination, not completely light the walkway or driveway.

If we compare the problem with that of measuring the illumination due to a source of light, we see at once how different it is.

A hush is falling over the crowd and the stadium lights are collecting into beams of illumination on the field and a thick fog of tension is building.

The discoveries of the separate paths of sensory and motor impulses in the spinal cord, and consequently of the laws of reflex action, by Charles Bell and Marshall Hall respectively, in their illumination of the phenomena of nervous function, may be compared with the discovery in the region of the vascular system of the circulation of the blood; for therein a key to large classes of normal and aberrant functions and a fertile principle of interpretation were obtained.

The eye end presents an refractor appearance too complicated to be figured here; it has a micrometer and its illumination for the position circle, a micrometer head, and a bright or dark field, clamps in right ascension and declination and quick and slow motion in the same, a finder, microscopes for reading the hour and declination circles, an illuminated dial showing sidereal time and driven by an electric current from the sidereal clock, and counter weights which can be removed when a spectroscope or other heavy appliance is added.

In that case the image of the double line shows a diminution of intensity along the centre, just sufficient to give a clear impression that we are not dealing with a single line, and the intensity at the minimum is 0.81 of that at the point of maximum illumination.

Supposing, however, there is oblique illumination, then formula (5) can always be applied to determine the magnifying power attainable with at least one objective.

In like manner we may find the illumination in any other direction, and it is obvious that it vanishes when sin 0 is any multiple of A/a.

Assent in religion as in everything else he could justify only on the ground of its harmony with reason; professed " illumination without search, and certainty without proof " was to him a sign of absence of the divine spirit in the professor.

These H structures are invisible, with ordinary illumination in living cells or unstained preparations, and can only be made clearly visible by special methods of preparation and staining first used by Loffler.

In any case the proportion of the whole illumination to be found outside the circle of radius r is given by J02(z)+J12(z).

The intellect, therefore, is one and continuous in all individuals, who differ only in the degree which their illumination has attained.

If you've never seem a tea light lamp before, they're basically lamp-shaped candle holders, complete with shades, that use a tea light candle instead of a lightbulb for illumination.

The only source of doubt as to the validity of the conclusion that this is really the zodiacal light arises from the possibility that, after the close of the ordinarily recognized twilight, there may be a faint illumination arising from the reflection of light by the very rare upper atmosphere, shown by the phenomena of meteors to extend some hundred miles or more above the earth's surface.

Radiometric corrections may be necessary due to variations in scene illumination and viewing geometry, atmospheric conditions, and sensor noise and response.

These diaphragms are sometimes fitted in a slide, so that it is possible to move the diaphragm sideways and give oblique illumination (see below).

Before his illumination he had been instructed by dreams, and enjoyed extraordinary visions, and heard mysterious conversations.

Optics offer Lens Peripheral Illumination Correction, which automatically compensates to prevent vignetting and lens shading, resulting in evenly balanced exposures.

The title of " apostle " was not limited to the immediate disciples of our Lord, but was given to missionaries or evangelists who went about founding new churches; the prophets spoke by revelation; the teachers were enabled by supernatural illumination to instruct others.

If flexibility and adaptable illumination is what you're looking for, a contemporary track lighting system may do the trick.

Sometimes a large part of the sky shows a diffuse illumination, which, though brighter in some parts than others, possesses no definite outlines.

This particular device is manufactured with a flat-topped led to provide excellent wide angle viewing for switchtop and annunciator illumination.

The inhabitants of tropical America sometimes keep fireflies in small cages for purposes of illumination, or make use of the insects for personal adornment.

He professed to rest all upon Scripture, yet accepted from the Babylon of Rome a baptism neither scriptural nor primitive, nor fulfilling the chief conditions of admission into a visible brotherhood of saints, to wit, repentance, faith, spiritual illumination and free surrender of self to Christ.

Not only does it provide overhead illumination, the heads can be positioned so that they're aimed at a mirror, or other area where more light is desired.

The extremely small particles of dust (motes in a sunbeam) in the rays are made perceptible by the diffracted light, whilst by ordinary illumination they are invisible.

Rolle then entered on the contemplative life, passing through the preliminary stages of purification and illumination, which lasted for nearly three years, and then entering the stage of sight, the full revelation of the divine vision.

Since we have now to integrate for the whole illumination at a particular point 0 due to all the components which have their foci in its neighbourhood, we may conveniently regard 0 as origin.

Types ofilluminationin slit lamp

By dark-field illumination it is even possible to make such small details of objects perceptible as are below the limits of the resolving power.

Designed for standard ceiling illumination, ceiling lights offer a variety of mounting options and unique style to create an easy solution to your lighting problem.

In estimating theoretically the resolving power on a double star we have to consider the illumination of the field due to the superposition of the two independent images.

In some ways HTML (Hyper Text Markup Language) is the heir to the finer arts of calligraphy, illumination, typesetting, and later layout and typography.

Consequently he censures the opinion of those who in the illustration of the Scriptures refer everything to the illumination of the Holy Spirit, as well as that of others who, disregarding all knowledge of the languages, would explain words by things.

Owing to the slight difference of illumination between the immersion liquid and the cover, the portion of light reflected on the cover is not noticeable.

Thus the scales, the positionand declination-circles, the field of view, the heads of all the micrometer-microscopes, the focusing scale, &c., are read without the aid of a hand-lamp and with an amount of illumination that can be regulated at the observer's pleasure.

When you think of the letter "i," what springs to mind? Maybe igloos and icicles? When the letter "i" takes on the verb form, we’re met with all kinds of interesting creations, from illuminate, to illustrate, to immortalize. An "i" verb may be just the ticket if you’re trying to improve your writing. Let’s take a look at 50 of the most popular verbs that start with "i."

For example, two to five rows of globules were produced, and photographed, between the bristles of mosquito wings by using oblique illumination.

The corded version is designed for LX200 and other telescopes that have a power output socket and handset controls for adjusting the reticle illumination.

The inconvenience of orthogonal illumination, which certainly gives better results, is avoided in the coaxial apparatus.

Another sermon, published in 1734, on the Reality of Spiritual Light set forth what he regarded as the inner, moving principle of the revival, the doctrine of a " special " grace in the immediate and supernatural divine illumination of the soul.

From the general formula (2), if A be the area of aperture, 102 = A2 / x2 f (7) The formation of a sharp image of the radiant point requires that the illumination become insignificant when, n attain small values, and this insignificance can only arise as a consequence of discrepancies of phase among the secondary waves from various parts of the aperture.

Types ofilluminationPDF

The large loss of light, which is caused in dark-field illumination by the cutting off of the direct cone of rays, must be compensated by employing exceptionally strong sources.

By the principle of energy the illumination over the entire focal plane must be equal to that over the diffracting area; and thus, in accordance with the suppositions by which (3) was obtained, its value when integrated from E= co to = -1-x, and from n = - oo to n = -1-oo should be equal to ab.

The readiest method of obtaining instantaneous illumination is the electric spark, but with this Magnus was not successful.

Hence the illumination of the screen by the light passing through the hole is precisely what would be cut off by a disk which fits the hole, and the complement of fig.

Herodotus describes the oil pits near Ardericca (near Babylon), and the pitch spring of Zacynthus (Zante), whilst Strabo, Dioscorides and Pliny mention the use of the oil of Agrigentum, in Sicily, for illumination, and Plutarch refers to the petroleum found near Ecbatana (Kerkuk).

Illuminationlighting design

Track lighting is an excellent accompaniment to general lighting, but is often too focused and specialized to provide the only illumination in a room.

If your mirror reflects natural light from a window, the natural light offers a softer illumination by bringing a touch of the outdoors inside.

Progress Lighting has a number of illumination solutions, as well as a dealer locater so you can work with a lighting specialist close to home.

Ancient philosophers, who had not the Scriptures, received direct illumination from God, and only thus can the brilliant results attained by them be accounted for.

Remember that there is a difference between daylight and nighttime illumination, so you will need to adjust the amount of makeup you wear accordingly.

According to the undulatory theory the light cannot be regarded strictly as travelling along a ray; but the existence of an unobstructed ray implies that the system of Fresnel's zones can be commenced, and, if a large number of these zones are fully developed and do not terminate abruptly, the illumination is unaffected by the neighbourhood of obstacles.

Sometimes this insight is claimed as the result of the operation of some higher faculty or some supernatural revelation to the individual; in other instances the theosophical theory is not based upon any special illumination, but is simply put forward as the deepest speculative wisdom of its author.

Half-shade analysers depend upon the facility with which the eye can distinguish slight differences in the intensities of two streams seen in juxtaposition, when the illumination is not too bright.

One is the existence of dark and bright regions, irregular in form, on its surface; the other is the complete illumination of the lunar disk when seen as a crescent, a faint light revealing the dark hemisphere.

And yet, while the miniature has a career of its own in artistic development which may be more conveniently dealt with under a separate heading (see Miniature), its decorative qualities are so closely bound up with those of the initial and border that an historical description of illumination must give full recognition to its prominent position in the general scheme of book-ornamentation of the middle ages.

At the same time, the repression of idealism and sentiment during the period of " illumination " was amply revenged, and the barren age of reason gave place to Romanticism.

When the interval is very small the discrepancy, though mathematically existent, produces no practical effect, and the illumination at B due to P is as important as that due to A, the intensities of the two luminous sources being supposed equal.

LEDilluminationlights

We have ultimately G =o, H = (7rV)- 1, so that 1 2 = I / 12V 2, or the illumination is inversely as the square of the distance from the shadow of the edge.

The 10th century, by means of this illumination of one of the darkest regions of disease, may diminish human suffering enormously, and may make habitable rich and beautiful regions of the earth's surface now, so far as man's work is concerned, condemned to sterility.

But the illumination of the bow is so weakened by the repeated reflections, and the light of the sun is generally so bright, that these bows are rarely, if ever, observed except in artificial rainbows.

It isn't the best choice for overall illumination, but can add good accent and task lighting with flexibility and style.

Apparatus for a good dark field illumination has received much attention, because in this way ultra-microscopical particles can be made visible.

An illumination of variable intensity (according to the deeper or lighter shades of the portion of the picture on which the light falls) thus takes place on the selenium cell.

These may be called the spinal eyes, and it is said that they are disposed in such a way as to receive illumination preferentially from the right side, although this fact has no relation with the side upon which Amphioxus may lie upon the sand.

The yellowing and subsequent casting of leaves, for instance, is a very general symptom of disease in plants, and may be induced by drought, extremes of temperature, insufficient or excessive illumination, excess of water at the roots, the action of parasitic Fungi, insects, worms, &c., or of poisonous gases, and so forth; and extreme caution is necessary in.

The dorsiventrality of the prothallus has been shown to depend mainly on the illumination, the filamentous form being retained in feeble light; a similar result is obtained when the prothalli are cultivated in water.

Such a plate has the power of a condensing lens, and gives an illumination out of all proportion to what could be obtained without it.

All the space behind the mirror will become dark, and all the space in front of the mirror will acquire an exalted illumination.

We will next suppose that the light is transmitted by a slit, and inquire what is the effect of varying the width of the slit upon the illumination at the projection of its centre.

For example, in a space that needs a lot of light such as a kitchen, a U-shaped or square-shaped configuration can be installed to provide maximum illumination.

It may be due to insufficient illumination (Etiolation), as seen in geraniums kept in too shaded a situation, and is then accompanied by soft tissues, elongation of internodes, leaves usually reduced in size, &c. The laying of wheat is a particular case.

In the direction (suppose horizontal) for which n=o, /f=sin 0, the phases of the secondary waves range over a complete period when sin 0 =X/a, and, since all parts of the horizontal aperture are equally effective, there is in this direction a complete compensation and consequent absence of illumination.

But this procedure (apart from the question of illumination) is open to the objection that it makes excessive demands upon accuracy.

Forty times, it is said, he read through the Metaphysics of Aristotle, till the words were imprinted on his memory; but their meaning was hopelessly obscure, until one day they found illumination from the little commentary by Farabi, which he bought at a bookstall for the small sum of three dirhems. So great was his joy at the discovery, thus made by help of a work from which he had expected only mystery, that he hastened to return thanks to God, and bestowed an alms upon the poor.

Circle ofillumination

The streets are lighted with electricity and gas, the Ouvidor and some other narrow streets having a great number of gas-pipe arches across them for decorative illumination on festal occasions.

So long as the pupil of the observer alone undertakes the regulation of the rays there is no perceptible diminution of illumination in comparison with the naked eye vision.

In the Red Sea regions frankincense is valued not only for its sweet odour when burnt, but as a masticatory; and blazing lumps of it are not infrequently used for illumination instead of oil lamps.

The planets in question appeared in the telescope as star-like objects which could be compared with the stars with much greater accuracy than a planetary disk like that of Mars, the apparent form of which was changed by its varying phase, due to the different directions of the sun's illumination.

If the point under consideration be so far away from the geometrical shadow that a large number of the earlier zones are complete, then the illumination, determined sensibly by the first zone, is the same as if there were no obstruction at all.

Let in some light - Light colors and even illumination from an overhead fixture or nearby window gives your kitchen an instant facelift.

The stem, by pointing directly to the light source, secures the best illumination possible for all of its leaves, the latter being distributed symmetrically around it.

There's a big difference between choosing a row of pendants to highlight a dining table and picking lights to increase the overall illumination in a room.

If on the other hand the number of zones be odd, the effects conspire; and the illumination (proportional to the square of the amplitude) is four times as great as if there were no obstruction at all.

There were few instances of people wearing beards, swinging from chandeliers (indeed any forms of illumination) or bringing turtles.

Under the microscope, using dark-ground illumination, a single pollen covered filament can be seen to have spiked ridges.

During his residence in Birmingham, Messrs Chance being makers of glass for use in lighthouse lamps, his attention was naturally turned to problems of lighthouse illumination, and he was able to devise improvements in both the catoptric and dioptric methods for concentrating and directing the beam.

The response to the action of light in diatropic leaves is, according to Haberlandt, due to the presence of epidermal cells which are shaped like a lens, or with lens-shaped thickenings of the cuticle, through which convergence of the light rays takes place and causes a differential illumination of the lining layer of protoplasm on the basal walls of the epidermal cells, by which the stimulus resulting in the orientation of the leaf is brought about.

The conceivable variations in the conditions which would count in algal life are variations in the chemical character of the water - whether fresh, brackish or salt; or in the rate of movement of the water, whether relatively quiet, or a stream or a surf; or in the degree of illumination with the depth and transparency of the water.

This particular device is manufactured with a flat-topped LED to provide excellent wide angle viewing for switchtop and annunciator illumination.

His scientific work was chiefly concerned with galvanism and its medical applications, with the construction and illumination of lighthouses, and with experiments for preserving human life and material objects from destruction by fire.

The intellect has in itself power to know ultimate truth and intelligence, and does not require a mystical illumination as Ghazal" taught.

Their absolute freedom from diffraction, the perfect control of the illumination and thickness of the lines, and the accuracy with which it will be possible to construct scales for zone observations will be important features of the new method.