Let me be more precise: The yellow colour of the spectrum extends over a sensible space, blending on one side with the orange and on the other with the green.
By allowing the violet and ultra-violet rays of the spectrum to fall upon sulphate of quinine and other substances Professor Stokes has changed the periods of those rays.
Looking through a prism at the incandescent image of the carbon points, the light of the image is decomposed, and a complete spectrum is obtained.
When the carbon is made the positive electrode of the lamp, the resultant spectrumshows the brilliant yellow lines of the metal sodium.
This is actually the case when the waves of the visible spectrumpass through a transparent gas or vapour.
I pass a beam through our two prisms, and the spectrum spreads its colours upon the screen.
Intercepting the luminous portion of his spectrum he brought, by a converging lens, the ultra-red rays to a focus, but by this condensation he obtained no light.
The spectrum of this arc is not continuous like that of the solid carbon points, but consists of a series of vivid bands, each corresponding in colour to that particular portion of the spectrum to which its rays belong.
When different salts are mixed together, and rammed into holes in the carbon; a spectrum is obtained which contains the bands of them all.
At one end of this spectrum we have red light, at the other, violet; and between those extremes lie the other prismatic colours.
The earth itself offers evidence of a fiery origin; and in our day the hypothesis of Kant and Laplace receives the independent countenance of spectrum analysis, which proves the same substances to be common to the earth and sun.
The light of our electric lamp shining through such a composite flame would give us a spectrum cut up by dark lines, exactly as the solar spectrum is cut up by the lines of Fraunhofer.
This prediction was verified in its discovery (in 1875) by its characteristic spectrum (two violet lines).
A bright golden color, reflecting more light than any other except white; the color of that part of the spectrum which is between the orange and green.
As they increase in complexity other elements are added, until the spectrum exhibits all the elements we know of.
When a beam of light is analysed in the spectroscope the red rays are bent least and the blue rays most, so that the red rays fall at one end of the spectrum and the blue at the other.
In the spectrumwe see real green light; from green paint made by mixing yellow and blue, we only see an imitation or artificial green.
The very limited capacity of the eye to receive sensation from light rays is proved by the discovery that the spectrum possesses other rays, called heat-rays, which the eye cannot perceive.
Only about a third of the spectrumis visible to the eye.
Is not the very spectrum of the spark, in which we recognize the lines of the metal of the electrode, a proof of it?
Course after course was sent out, only to flare viciously through the spectrum and to go black!
Driven now at full rating those frightful weapons lashed out against the Nevian blocking the way, and under their impacts her screens flared brilliantly through the spectrum and went down.
Time after time each contestant ran the gamut of the spectrum with his every available ultra-force, only to find all channels closed.
In that course he was rapidly approaching a sun, an ordinary G-type dwarf, whose spectrum revealed a blaze of lines of the precious element for which he was searching.
Avogadro's law and spectrum analysis are but two illustrations of the relationship, but many other examples are equal to them in importance.
The compound nature of white light; or, the beginning of Spectrum Analysis.
Whatever rank this coruscating star may eventually take in the firmament of fame, its spectrum is not that of Scotland.
Could we take the spectrum of those first wreaths of smoke curling from cottage chimneys, we might find traces of peat and porridge, yet also of coal and bacon.
The speculation about what the green fireballs were ran through the usual spectrum of answers, a new type of natural phenomenon, a secret U.
The most interesting feature of the spectrum of this new star was the fact that it showed both light and dark lines for the same substances, the two lying somewhat apart.
His studies have shown that the elements do not always give the same spectrum under all conditions; a result quite at variance with the earlier ideas on the subject.
As we said a moment ago, radium appears to be an elementary substance, as shown by its spark-spectrum being different from that of any other known substance--the determinative test as fixed by the International Chemical Congress.
At times when the sun-spots are numerous and vigorous in their action, the spectrum of the elements in these spots becomes changed.
Reasoning from analogy, it may be supposed that a corresponding layer of the atmosphere of other stars is the one which gives us the reverse spectrum of those stars.
During the times of minimum sun-spot activity the spectrum shows, for example, the presence of large quantities of iron in these spots--of course in a state of vapor.
Bay-ley) spies on the spectrum of the gas, and learns some of its innermost secrets.
If with a glass prism of a certain form we produce a spectrum of the sun, this spectrum will be thrown a certain distance away from the point on which the sun's rays would fall if not interfered with.
Now, if we change our prism for another of exactly the same shape, but made of a different kind of glass, we shall find the spectrum thrown to a different spot.
Secchi considers that there is evidence of an actual change in the spectrum of the star, an opinion in which Mr. Huggins does not coincide.
Hydrogen appears to be absent, or, more correctly, there are no lines in the star's spectrum corresponding to those of hydrogen in the solar spectrum.
The spectrum will have a certain length, depending on the dispersive power of the glass.
In the spectroscope, Mr. Huggins informs us, the spectrum is peculiar.
All our best tests show the spectrum of this light to be continuous, and therefore reflected; which indicates that it is a ring of small masses of meteoric matter surrounding the sun, revolving with it and reflecting its light.
In the upper part is seen the spectrum of bright lines given by glowing hydrogen gas.
In 1877 Professor Draper announced the discovery of oxygen lines in the spectrum of the sun.
The dark lines of thespectrum are the cutting out of rays of definite wave-lengths.
What we want is that each point in the spectrum should be made of rays of the same number of vibrations.
If the color spectrum moves away, they move with it, and away from their proper place in the ordinary spectrum.
It had then three bright hydrogen lines, the strong double sodium line, and others, which made, it strongly resemble the spectrum of the chromosphere of our sun.
A, which renders the rays parallel, and passing [Page 50] through the prisms out to telescope B, where the spectrum can be examined on the retina of the eye for a screen.
A spectrumis a collection of the colors which are dispersed by a prism from any given light.
Thus, if we take half the length of the spectrum by a pair of compasses, and fix one leg in any colour, the other leg will hit upon its accidental colour.
About this time I find observations of the spectrum of Sirius.
These bands to which there is nothing corresponding in the Solar Spectrum (except some very faint lines) have also been subsequently remarked in the spectrum of several spots.
Achromatic object-glasses are placed on both sides of the prism, so that each pencil of light through the prism consists of parallel rays; and breadth is given to the spectrum by a cylindrical lens.
Light corresponding to the Lines in the Dispersion Spectrum measured by Kirchhoff.
The spectrum of Coggia's Comet was examined at every available opportunity last July, and compared directly with that of carbon dioxide, the bands of the two spectra being sensibly coincident.
This spectrum is apparently the same as that of the bright Pleiades stars.
The spectrum of a star is as the same library when the books are arranged on the shelves in complete perfection and simplicity, so that he who looks may appraise its contents at any or all points.
The effect of the bombardment by small particles can be only skin deep, and the brightness of the star should diminish rapidly and therefore the spectrum change speedily from one type to another.
The stretches ofspectrum between the dark lines are of course continuous-spectrum radiations.
The close relationship of the bright-line nebular spectrum, the bright-line stellar spectrum and the spectra of the simplest helium stars; the practically continuous sequence of spectra from the helium stars to the red stars.
This is necessarily gradual, and the corresponding changes of spectrum should likewise be gradual and continuous.
A slightly older stage of stellar existence is indicated by the type of spectrum in which some of the lines of hydrogen, always those at the violet end, are dark, and the remaining hydrogen lines, always those toward the red end, are bright.
In a few months or years the nebular lines diminish in brightness, and the continuous spectrum develops.
The spectrum is a very close approach to thespectrum of our Sun.
In 1814 Fraunhofer made a spectrumin the same way, but happened to look at it with a telescope.
This act changed the course of the science of optics for all time; it was the origin of Spectrum Analysis, one of the chief products of the human mind, one of the corner-stones upon which rests the structure of modern science.
Stellar spectra are clear cut and steady, and in the solar spectrum the Fraunhofer lines are perfectly defined, the thin lines, in diameter equal to that of a spider's web, can be seen without difficulty.
A century later Newton darkened a room, admitted solar rays through a round aperture in a shutter, passed them through a prism and obtained a clearer spectrum than Kepler's.
The diffuse nebulous matter streaming round the Pleiades might possibly be another instance, though the character of its spectrum had not yet been ascertained.
Professor Rowland had since shown us that if the whole earth were heated to the temperature of the sun, its spectrum would resemble very closely the solar spectrum.
The colours of the spectrum are thus recomposed in everything we see.
In the shadow the rays of the spectrum vibrate with different speed.
In the case of incandescent vapours, the exact correspondence of emission and absorption as regards wave-length of frequency of the light emitted and absorbed forms the foundation of the science of spectrum analysis.
Distribution of energy in the spectrum of a black body.
Paschen, and Lummer and Pringsheim verified this relation by observing with a bolometer the intensity at different points in the spectrum produced by a fluorite prism.
What is the form of the curve expressing the distribution of energy between the various wave-lengths in the spectrum of full radiation, or what is the distribution of heat in the spectrum?
The spectrumof chlorophyll, the green colouring matter of plants, shows two very strong absorption bands in the red.
Fraunhofer had noticed the coincidence of a pair of bright yellow lines seen in the spectrum of a candle flame with the dark D lines in the solar spectrum, a coincidence which was afterwards more exactly verified by W.
It is conspicuous by its absorption spectrumin many of the white stars.
Langley with the spectro-bolometer on the infra-red spectrum of sunlight, demonstrated the existence of marked absorption bands, some of which are due to water vapour.
The spectrum of helium as observed in a discharge tube is distinguished by a moderate number of brilliant lines, distributed over the whole visual spectrum.
This expression was found by Paschen to give a very good approximation to the form of the curve obtained experimentally for those portions of the visible and infra-red spectrum where observations could be most accurately made.
Distribution of energy in the spectrum of full radiation at 2000 deg.
On examining a solution of it, or rather the light passing through a solution of it, with the spectroscope, we ought to find that all the rays of the spectrum lying between and nearly to H and b (Fig.
Because from the white light falling upon it, it practically absorbs all the rays of the spectrum except the red and orange ones, and these it reflects.
Now the pure blue colouring matter would not yield a green with the pure yellow colouring matter, for if you plot off the two absorption spectra as previously described, on to the spectrum (Fig.
We get now a coloured band, similar to that of the rainbow, and this band is called the spectrum (see Fig.
An absorption spectrum is in each case obtained, but the one from the solution is the purer, for it does not contain the mixed white light reflected from the surfaces of coloured objects.
