Brackets join those lines between which several other lines are clearly visible if the dispersive power of the spectroscope permits distinguishing the neighbouring lines.
The dispersive force of evolution however tends to separate them more and more widely, until eventually oscillation ceases, if it does not become impossible.
Coupled with its great refraction, are the great dispersive and great reflective powers of diamond; hence the extraordinary radiance of the gem, both as regards white light and prismatic light.
Footnote 6: The low dispersive power of water masks, as Helmholtz has remarked, the imperfect achromatism of the eye.
Jena glass, described in another chapter of this book, with its extraordinary range of refractive and dispersivequalities has brought optical instruments to virtual perfection.
The difference of the angles of deviation for two selected rays measures their dispersion, and if this angle is divided by the deviation of the mean ray, we obtain the dispersive power of the prism.
The dispersive power is not the same for all parts of a refraction spectrum; besides, the same colours do not occupy the same positions in spectra formed by prisms of different material.
Transparent media vary in their dispersive powers; for example, carbon disulphide has more than three times the dispersive power of crown glass.
This produces a paste which has great brilliancy and refractive and dispersive powers, and also a similar specific gravity to the oriental diamond.
Therefore, on dispersive ground, I would inspire my men with unity of purpose.
When a chieftain is fighting in his own territory, it is dispersive ground.
The latter contains a considerable proportion of lead, in order to give it an increased dispersive power upon the rays of light, in proportion to its mean refractive power.
They possess not only a great refractive power in the mean ray of light, but a high dispersive agency, which enables them to throw out the most varied and vivid colours in multiplied directions.
Now, this sort of spectrum is greatly weakened by every increase of dispersive power, because the light is spread out into a longer ribbon and made to cover a more extended area.
On the other hand, a spectrum of bright lines undergoes no such weakening by an increase in the dispersive power of the spectroscope.
Two categories, which in primitive thought are thus interwoven in wild confusion, are, it may be suggested, religion and magic; and only in the dispersive process of evolution do they tend to become discriminated.
For while the spectral rays are separated by dispersive refraction, the polarized coloured rays are separated by the interference and annihilation of some rays, the remainder passing on to produce the colours.
But in this case the relative dispersive powers of the media composing the convex and the concave lenses form the point to be considered.
The doubly convex lens is composed of crown glass, and the concave lens of flint glass, which has a higher refractive and dispersive power than crown glass.
If the dispersive power of the media of which the convex and concave lenses are composed were the same, the dispersive power of the convex lens would be in excess, and the coloured rays in each compound ray could not become parallel.
Thus the dispersive power of flint glass and balsam are about equal, while that of crown glass is considerably less.
Now these, though made of flint glass, belong mostly to a time before full advantage had been taken of the dispersive power of that material upon the rays of light.
In dispersive power, on the other hand, it stands apart from both these substances and rivals the diamond in scattering the component rays of white light.
At the same time, the greater the amount of lead in a glass, the greater its dispersive power on the light that passes through it.
Brewster have determined that the sapphire possesses a stronger refraction than any other substance capable of giving a single image (diamond excepted), [p460] while its dispersive power is only 0.
Rules and principles for determining the dispersive ratio of glass; and for computing the radii of curvature for achromatic object-glasses, submitted to the test of experiment.
It leads us to ask, in the first place, whether the tendencies of the intellectual life are thus dispersive and opposed to the social tendencies?
These islands afford, therefore, test examples of the great dispersive powers of certain groups of organisms, and thus serve as a basis on which to found our explanations of many anomalies of distribution.
Thollon received in 1886 the Lalande Prize, exhibits, not the diffractive, but the prismatic spectrum as obtained with bisulphide of carbon prisms of large dispersive power.
It needs a powerfully dispersive spectroscope to show line-displacements of the minute order in question; and powerful dispersion involves a strictly proportionate enfeeblement of light.
Sir David) Brewster, the renowned Scotch physicist, suggested that certain advantages might accrue from the use of such gems as have high refractive and low dispersive indices, in place of lenses made of glass.
Christiansen's experiments on the dispersive properties of white powders.
Glasses can now be made differing considerably both in refractivity and dispersive power.
The second of these two expressions is generally given as the definition of dispersive power.
These effects are due to the difference in dispersive power of the powder and the liquid.
The phenomenon of dispersion shows that in dispersive media the velocity is different for lights of different wave-lengths.
If the refracting angle of the prism is small, then the ratio of the dispersion to the mean deviation of the two rays is the dispersivepower of the material of the prism.
The dispersive powers of gases are, however, generally comparable with those of liquids and solids.
Thus the ether within the dispersive medium is loaded with molecules which are forced to perform oscillations of the same period as that of the transmitted wave.
The spectrum will be straight if the two prisms are similar in dispersive property, but if one of them is constructed of a material which possesses any peculiarity in this respect it will be revealed by the curvature of the spectrum.
The true hyacinth has more snap and fire owing to its adamantine surface luster and high dispersive power, as well as to its high refractive index.
Of all colorless stones, the only one likely to mislead the expert in this respect is the whitened zircon (jargoon), which has almost adamantine luster and in addition nearly as high dispersive power as diamond.
There may be several different types of stones of a given color, but each will be found to have its own numerical properties such as density, hardness, refractive power, dispersive power, etc.
This shortness in the latter cases is due to the small dispersive power of the three minerals mentioned.
Stones of highdispersive power will display vivid color play in this position.
If a stone has high dispersive power it will exhibit "fire," as it is called--i.
Other materials than diamond behave similarly, but usually to a much smaller extent, for few gem materials have so high a refractive power or so great a dispersive power as diamond.
We may now consider how an acquaintance with the dispersivepowers of the various stones can be used in distinguishing them.
If the thickness be small, the order of the cardinal points is F'HH'F; a dispersive lens of this type is shown in fig.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "dispersive" in a variety of sentences. We hope that you will now be able to make sentences using this word.
