One of the masses of ice which he describes was crystallised in prisms of various numbers of sides: of these prisms the greater part were hexahedral and irregular.
In the free vertical column the prisms seemed to be deposited horizontally, and in the thicker parts they did not pass clear through.
In some cases there seemed to be capillary fissures coincident with the lines where several sides of prisms met.
Another mass was composed of prismsin the form of truncated pyramids; and in another he found quadrilateral and octahedral prisms, the former splitting parallel to the faces, and also truncated pyramids with five and six sides.
Wherever an incision was made in this sheet of ice, the prisms snapped off at the depth of an inch, and could be mowed down like corn by means of a stout knife.
The prisms and lenses in their initial stage are then handed on to women, who complete the work on their surfaces.
There is, I take it, no more interesting munitions development than in factories where these lenses and prisms are produced.
The component bodies of this portion are seen to be more or less elongated and flattened in the side view, forming prisms (fig.
In the plano-concave lens the triangular prisms may be considered as placed with their apices towards each other, and so would tend to disperse the coloured rays in the opposite direction, to form spectra at t t.
The same phenomena may also be exhibited by substituting two Nicol’s prisms for the tourmalines.
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.
In order to have the colors thoroughly dispersed, the best instruments pass the beam of light through a series of prisms called a battery, each one spreading farther the colors which the previous ones had spread.
Several of these prisms are jointed, that is, concave on the one side, and convex on the other; and some of them are divided by simple transverse intersections.
I saw several large prisms, on the truncatures of which are distinctly traced the outlines of a number of smaller prisms; that is, these prisms are formed of a basaltes, which has a tendency to subdivide itself likewise into prisms.
In several of theprisms I found some globules of zeolites, but in very small quantity.
I had before observed the same phenomenon in the basaltic prisms of Vivarais.
In some telescopes and also opera glasses, prisms are used for the purpose of obtaining erect images.
With prisms it is easily possible to locate a light so that it may be seen in two positions at the same time.
A passing breeze came through the open window and tinkled the prisms that hung from the chandelier.
It lighted up the polished surfaces of old mahogany, woke forgotten gleams from the worn old silver, and summoned stray bits of iridescence from the prisms that hung from the heavy gilt chandeliers.
A Summer wind, like a playful child, stole into the room, lifted the deep silk fringe of the shawl, made merry with it for a moment, then tinkled the prisms on the chandelier and ran away again.
Arsenic tribromide, AsBr3, is formed by the direct union of arsenic and bromine, and subsequent distillation from the excess of arsenic; it forms colourless deliquescent prismswhich melt at 20 deg.
Thou hast prisms of hope for the young; prisms of tears for the old, but shining always in our souls with a light all thine own.
The greater the number of prisms the wider is the dispersion of the rays and the longer is the spectrum, and the more easily studied are the peculiar lines which Wollaston and Fraunhofer found crossing it.
A comparative series of these granites, consisting of prisms and cubes of 4 and 2 in.
The revolution of the upright prismsperiodically increased the power of the beam, by condensation of the rays emergent from the fixed apparatus, in the horizontal plane.
It is claimed by the designer that the use of equiangular prisms results in less loss of light and less divergence than is the case when either the spherical or Fresnel form is adopted.
Before his death in 1827 Fresnel devised his totally reflecting or catadioptric prisms to take the place of the silvered reflectors previously used above and below the lens elements (fig.
The zones or prisms are generated round a vertical axis and divided into segments.
The prisms are so arranged that the apparatus, making one complete revolution in the minute, produces a group characteristic of 4 flashes in quick succession every 30 seconds (fig.
In the latter instrument Alan Stevenson introduced helical frames for holding the glass prisms in place, thus avoiding complete obstruction of the light rays in any azimuth.
Where the electric arc is employed it is often necessary to design the prisms so as to produce artificial divergence.
Fresnel devised these prisms for use in fixed light apparatus, but the principle was, at a later date, also applied to flashing lights, in the first instance by T.
To illuminate the near sea the vertical divergence of the lower prisms of the fixed belt was artificially increased.
In the early days of lens lights the only glass used for the prisms was made in France at the St Gobain and Premontre works, which have long been celebrated for the high quality of optical glass produced.
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.
Employ prisms enough, and eventually the undiminished rays of persistent colour will stand out from the continually fading rainbow-tinted band, by which they were at first effectually veiled.
The individual prisms are usually slender, with one beveled, wedge-like end, but are sometimes needle-like.
The macro- and brachy-prisms are often called "domes.
Iceland-spar) p, on the ends of which glass prisms w are cemented: the lens l is focused on a small square aperture o in the tube of the instrument.
The pyramids all consist of six faces at one end of the crystal, and prisms are all hexagonal prisms; perpendicular to the hexad axis are the pedions.
All the forms, except the prisms and basal pinacoid, are sphenoids.
The prisms {hko} and the macro- and brachy-pinacoids are geometrically the same in this class as in the last.
The prisms are geometrically the same as in the holosymmetric class.
All the prisms are trigonal prisms; and perpendicular to these are two pedions.
All the closed forms are hexagonal bipyramids; the open forms are hexagonal prisms or the basal pinacoid.
The larger microliths may contain enclosures of glass, and it is very common to find that the prisms have hollow, funnel-shaped ends, which are filled with vitreous material.
Wünsch produced five spectra, with five prismsand five small apertures, and he mixed the colours first in pairs, and afterwards in other ways and proportions.
But, prior to this, it will be desirable to establish still further the analogy between the action of the prismsand that of the two plates of tourmaline.
At the present moment the prisms are crossed, and the screen is dark.
With his large Nicol prisms he in the first place repeated and explained the experiments of Foucault and Fizeau, and subsequently enriched the subject by very beautiful additions of his own.
An elementary consideration suffices to show, that when the directions of vibration of the prisms and the gypsum enclose an angle of forty-five degrees, the colours are at their maximum brilliancy.
Two Nicol prisms play the same part as the two plates of tourmaline.
The crystal grows, and finally we have large prisms of nitre, each of a perfectly definite shape.
When the film is turned from this direction, the colours gradually fade, until, at the point where the directions of vibration in plate and prisms are parallel, they disappear altogether.
The two prisms employed in these experiments were lent to me by my lamented friend Mr. William Spottiswoode, and they were manufactured by Mr. Ahrens, an optician of consummate skill.
You have seen in these lectures a single prism employed to produce a spectrum, and you have seen a pair of prisms employed.
The base line between the eyes is increased in the Zeiss instrument by means of a system of prisms so as to give a widened base of binocular vision, and of mirrors which give magnifying power.
This is done by making the powder in large granules or in the shape of six-sided prisms with holes through them (prismatic powder).
One modification separated out in the form of rhombic octahedra, another in oblique plates, and a third in long brittle prisms or plates.
It crystallises from an aqueous solution in dense, volatile, lustrous prisms (up to 1 in.
It crystallises easily in long striated six-sided rhombic prisms terminating in rhombic pyramids.
Of course, it was the biggest and fanciest lamp in the lot that was broken--a tall one with a frosted glass shade and a row of crystal prisms dangling around the bowl of it.
Prisms don't know they are prisms but everybody who looks at them sees the beautiful places they make in the world.
There were enough prisms for nearly every member in the church to claim one.
Permanent resistance and limiting resistance of prisms to longitudinal extension and compression.
Use of doubly-refracting prisms to measure apparent diameters, &c.
Two triangularprisms of the same base and the same height are equivalent.
Three prisms will give eight images, but this is practically not a good combination; the images fail in distinctness, and are too near together for use.
Again, each lens of a stereoscope of long focus can have one or a pair of these prisms attached to it, and four or eight images may be thus combined.
Two such prisms set one behind the other can be made to give four images of equal brightness, occupying the four corners of a rhombus whose acute angles are 45°.
A passing vehicle in the street, however, now and then drew a shiver of sound from the pendent prisms of the chandelier.
The usual smile of ecstatic admiration spread over Jules's features as he touched the match to the simulated wicks, and lighted into life the rainbows in the prisms underneath.
A mineral occurring usually in three-sided or six-sided prisms terminated by rhombohedral or scalenohedral planes.
A kind of symmetry characteristic of certain crystals which from twinning, or other causes, come to resemble forms of a system other than that to which they belong, as the apparently hexagonal prisms of aragonite.
It is used for the prisms of the polariscope, because of its strong double refraction.
A variety of mimetite or arseniate of lead in hexagonal prisms of a fine orange yellow.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "prisms" in a variety of sentences. We hope that you will now be able to make sentences using this word.
