The result is that no trace of " fiddling " exists, and the movable and fixed webs come sharply together in focus with the highest powers.
I've been thinking about rigging up something on the front to catch the webs.
It didn't spin webs and looked more to Evelyn like a mutated cat, but the moment she recalled Kiera's fear, she also realized that the cat-like creature would easily pass as a large spider.
One of the most essential points in a good micrometer is that all the webs shall be so nearly in the same plane as to be well in focus together under the highest powers used, and at the same time absolutely free from " fiddling."
To avoid such error Dawes used double wires, not spider webs, placing the image of the star symmetrically between these wires, as in fig.
Other astronomers use the two distance-measuring webs, placed at a convenient distance apart, for position wires.
I, 2 and 3), used to bolt the head of one of the screws, and the instrument was provided with a slipping piece, giving motion to the micrometer by screws acting on two slides, one in right ascension, the other in declination, so that " either of the, webs can be placed upon either component of a double star with ease and certainty (Mem.
But in OS measures index error can be eliminated by bisecting both stars with the same web (or different webs of known interval fixed on the same frame), and not employing the fixed web at all.
The five fixed webs are attached to the table which is secured to the bottom of the box by the screws p. The three movable webs are attached to the projections XX on the frame aa.
These furrows have apparently been cut in situ with a very accurate engine; for not the slightest departure from parallelism can be detected in any of the movable webs relative to the fixed webs.
The varnish to fix the webs is applied, not on the surface T as is usual, but on a bevel for the purpose,' the position of the webs depending on their tension to keep them in their furrows.
a convenient feature in Repsolds' micrometer that the webs are very near the inner surface of the top of the box, so that the eye is not brought inconveniently close to the plate when high powers are used.
Da and The micrometer box, and of course with it the whole system of spider webs, is moved by the screw s, whilst the measuring web is independently moved by the screw S.
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.
In all modern reading micrometers the cross webs of fig.
If the reading for coincidence of the movable with the fixed webs is known, we then obtain from the single reading of S the difference from coincidence of the divisions of the two scales.
The object glass of the micrometer-microscope is placed midway between the plane of the photographic plate and the plane of the micrometer webs.
webs serve not only for pointing on stars to determine their coordinates (in manner afterwards described), but also for estimating the diameters of the star-images in terms of these 4" intervals.
The double webs composing the sides of the fixed square shall be strictly parallel, and shall form a true square of exactly ten revolutions of the screw on the side.
The micrometer readings for coincidence of the movable webs with the webs of the fixed square shall be exactly 0 000R and io-000R.
The image of a normal reseau-square, as viewed in the microscope, shall exactly coincide with the square formed by the fixed webs - that is to say, the image of the sides of a normal reseau-square shall measure exactly io screw-revolutions.
By means of the quick rack motions A and B move the plate so as to bring the reseau-square into the centre of the field of the micrometer; then, by means of the screw heads o, p, perfect the coincidence of the " fixed square " of webs, with the image of the reseau-square.
Similarly, place the star's image in the middle of the webs moved by Y.
Estimate the diameter of the star's image in terms of the 4" intervals of the movable webs.
In the members of the typical genus Lemur, as well as in the allied Hapalemur and Lepidolemur, none of the toes or fingers are connected by webs, and all have the hind-limbs of moderate length, and the tail long.
These webs, which are typically subcircular in form, consist of a system of threads radiating from a common centre and crossed at intervals, and approximately at right angles, by a series of concentric lines, the whole being suspended in a triangular, quadrangular or polygonal framework formed of so-called foundation lines, attached to the branches or leaves of trees or other firm objects in the neighbourhood.
Perfect orbicular webs are made by many genera of Argyopidae (Zilla, Meta, Gasteracantha), the best-known example being that of the common garden spider of England, Aranea or Epeira diademata; but these webs are not associated with any tubular retreat except such as are made under an adjoining leaf or in some nook hard by.
It was formerly supposed that this custom was peculiar to a single species, which was called the "gossamer" spider from the fact that the floating webs, when brought to the earth by rain or intercepted by bushes and trees, coat the foliage or grass with a sheeting of gossamer-like silk; but the habit is now known to be practised by the newly-hatched young of a great variety of species belonging to several distinct families.
Two genera of Argyopidae (Hyptiotes and Theridiosoma) construct spring-nets out of their incomplete webs of the orbicular type.
Males of the Argyopidae hang on the outskirt s of the webs of the females and signal their presence to her by jerking the radial threads in a peculiar manner.
Sometimes the shape of the spider combines with the colour to produce the same effect, as in the species of Uloborus, which as they hang in thin shabby-looking webs exactly resemble fragments of wind-blown rubbish.
The fore-limbs have four toes and a rudimentary thumb, all with claws; the hind limbs are larger, with five distinct toes, united by short webs at their bases.
For an account of the courtship and dancing of spiders, of their webs and floating lines, the reader is referred to the works of M'Cook (30) and the Peckhams (31), whilst an excellent account of the nests of trap-door spiders is given by Moggridge (32).
The genus Machaeropterus, consisting of four species, is very remarkable for the extraordinary form of some of the secondary wingfeathers in the males, in which the shaft is thickened and the webs changed in shape, as described and illustrated by P. L.
This micrometer is provided with two pairs of parallel webs.
One fixed pair of webs is attached to the micrometer-box, the other pair is moved by the screw S.
It was he who compared laws to spiders' webs, which catch small flies and allow bigger ones to escape.
The two centre tail feathers attain a length of 34 in., and, being destitute of webs, have a thin wire-like appearance.
In the red bird of paradise (Paradisea rubra) the same feathers are greatly elongated and destitute of webs, but differ from those in the other species, in being flattened out like ribbons.
Itl ' At first girders had soli or plate webs, but for spans o 9 over ioo ft.
It was soon found that with plate webs the ratio of depth to span could not be economically increased beyond to T I T.
- In the case of girders with braced webs, the tension bars of which are not adapted to resist a thrust, another circumstance due to the position of the live load must be considered.
The Embiidae live in warm countries, and are very retiring in their habits, hiding under stones where they spin webs formed of silk produced by glands in the basal segments of the fore-feet.
The webs and nests, &c., formed by spiders are also of silk.
It is now generally accepted that these sounds are produced by the vibration of the webs of the outer tail-feathers, the webs of which are modified.
The males are without these protective spines and are exposed to special dangers as they wander in search of the webs of the females.
The almucantar was therefore used only to observe the vertical transits of stars in different azimuths over fixed horizontal webs, without touching the telescope.
polnatorhinus (often incorrectly spelt pomarinus), about the size of a common gull, Larus canus, and presenting, irrespective of sex, two very distinct phases of plumage, one almost wholly sooty-brown, the other particoloured - dark above and white on the breast, the sides of the neck being of a glossy straw-colour, and the lower part of the neck and the sides of the body barred with brown; but a singular feature in the adults of this species is that the two median tail-feathers, which are elongated, have their shaft twisted towards the tip, so that in flight the lower surfaces of their webs are pressed together vertically, giving the bird the appearance of having a disk attached to its tail.
long; b, b, Panels, with base board for webs of thin holland 15 in.
These straps shall be made of wrought-iron or steel, and shall be riveted or bolted to the flanges or to the webs of the beams or girders.
between centres; their ends are usually framed to fit the form of the girders, and rest either upon their lower flanges, or upon seats formed of angles riveted to their webs, being secured to them by a pair of angles at each end of the beam riveted to its web and to the web of the girder.
Sometimes the beams rest upon the girders, and are riveted through the flanges to it; in this case the abutting ends of beams are spliced by scarf plates placed on each side of the webs and secured by rivets.
The outer lanceolate scapulars have one-half of their webs pure white, forming a conspicuous stripe along the side of the back.
To this family also belong the Rhacophorus of eastern Asia, arboreal frogs, some of which are remarkable for the extremely developed webs between the fingers and toes, which are believed to act as a parachute when the frog leaps from the branches of trees (flying-frog of A.
The otter has an elongated, low body, short limbs, short broad feet, with five toes on each, connected together by webs, and all with short, moderately strong, compressed, curved, pointed claws.
Other spiders weave these beautiful, symmetrical, ethereal webs whose designs have been the inspiration for art and mythology for as long as there were spiders, he explained.
Imagine trying to monitor zillions of these webs.
adaptations of organisms, Food webs, Energy flow, Coastal management.
As the dominant marine arthropods, crustaceans occupy a central and essential position in aquatic food webs.
The spiders and I have a truce, but if their webs become too blatant I start wielding my feather duster with a vengeance!
Scanner 8 tracks here, all of which are intriguing & rather convoluted webs of sound.
I rode a trout today, and drank the dew from spiders ' webs.
Initially the bottom slab and webs including the diaphragms were cast, with the top slab cast in a second stage.
gossamer webs for display.
hand-woven cloth, called webs, were around two hundred yards long.
huntsman watching the huntsmen spiders climb down their webs and drink from the puddles.
I always found baby palmettos tangled in the webs when I dusted periodically.
palmettos tangled in the webs when I dusted periodically.
By varying the compilation parameters, different webs may be produced over similar material for different audiences.
Dan took some great pix of the spiders webs in our garden this morning which were all frozen!
Seen en masse, the effect of these rippling color fields, outlined by dark webs, is almost psychedelic.
This is the highly anticipated sequel to Lightning Pool, one of the webs most popular casual games.
Spiders use webs to trap their victims, then using their potent venom, they slowly digest their prey.
wasp spiders Argiope bruennichi were found on their webs in Latchford Meadow in late August.
At present there are upwards of fifty hand-loom weavers employed, the webs being chiefly plain silk.
wintry sun Lit instead the webs that spiders weave.
To obviate this difficulty Felice Fontana of Florence (Saggio del real gabinetto di fisica e di storia naturale, 1 755) first proposed the use of spider webs in micrometers,' but it was not till the attention of Troughton had been directed to the subject by Rittenhouse that the idea was carried into practice.'
Two spider webs are stretched across the forks, one (t) being cemented in a fine groove cut in the inner fork k, the other (s) in a similar groove cut in the outer fork 1.
These grooves are simultaneously cut in situ by the maker, with the aid of an engine capable of ruling fine straight lines, so that the webs when accurately laid in the grooves are perfectly parallel.
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).
Now direct the telescope to a star near the equator and so that the star's image in its diurnal motion shall pass across the intersection of the two webs which mark the axis of rotation of the micrometer box.
7, and believed that by the use of wires,, much thicker than spider webs, the eye could estimate more accurately the symmetry of the star-images with respect to the wires.
This plan has the advantage of permitting easy adjustment of the webs to such a distance apart as may be found most suitable for the particular observation, but has the disadvantage that it does not permit the zero of the position-circle to be determined with F IG- the same accuracy; because, whilst by means of the screw s 7 (fig.
moves both webs together with respect to the star's image in the direction of the axis of the screw.
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).
It seems also to take a very clean V cut, as the webs can be laid in their furrows with an astonishing ease and precision.
Under such powers the webs can be brought into apparent contact with such precision and delicacy that the uncertainty of measurement seems to lie as much in the estimation of the fraction of the division of the head as in the accuracy of the contact.
Repsolds in more recent micrometers under construction give a second motion to the eyepiece at right angles to the axis of the micrometer screw; this enables the observer to determine the zero of position-angle for his movable webs with the same accuracy as he formerly could only do for the so-called position-angle webs.
One drawback to this form of instrument is that the two webs cannot be viewed simultaneously, and therefore the observer must rely on the steadiness of rate of the clockwork and uniformity in the conditions of refraction whilst the eye is moved from one eyepiece to the other.
Micrometers used for subdividing the spaces on graduated circles and scales have, in general, only a single pair of cross-webs or parallel webs moved by a single screw.
The focal length of the objective and the distance between the optical centre of the lens and the webs are so arranged that images of the divisions are formed in the plane of the webs, and the pitch of the screw is such that one division of the scale corresponds with some whole number of revolutions of the screw.
14 a division is represented bisected by cross webs, and five revolutions of the screw correspond with one division of the scale.
14 are replaced by parallel webs embracing the division (fig.
15, on one of the scales, by moving the whole micrometer box by means of the screw s; the pair of webs, moved by the screw S, is then pointed upon an adjacent division on the other scale.
13 r qn ui, c It is generally possible so to arrange the method of observation as to eliminate the effect of an error in " the reading for coincidence of the webs " from the results.
X 5 mm., the sides of this square being parallel spider webs 4" of arc apart; the size of the square is reckoned from centre to centre of these double webs.
Each of the two micrometer screws X and Y moves a system of six parallel webs, placed 4" of arc apart from each other.
The webs of each set of movable webs shall, inter se, be strictly parallel, and the two sets shall be strictly at right angles to each other.
By means of one of the micrometer screws X place the star's image in the middle of the six parallel webs which are moved by X.
Vogel and his successors employed one or other form of measuring machine, provided with a microscope having single or close parallel webs which could be successively pointed on the photographed lines of the star spectrum and the lines of the terrestrial spectrum.
By directing the telescope to a distant object, or to the intersection of the webs of a fixed collimating telescope (see Transit Circle), it is easy to measure the effect of a small change of zenith distance of the axis of the telescope in terms both of the level and of the micrometer screw, and thus, if the levels are perfectly sensitive and uniform in curvature and graduation, to determine the value of one division of each level in terms of the micrometer screw.
Two female wasp spiders Argiope bruennichi were found on their webs in Latchford Meadow in late August.
The flowers gone, the crisp and wintry sun Lit instead the webs that spiders weave.
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In other games you'll swing and jump across webs in order to save Mary Jane, the woman you love.
Baby Argiope spiders make tiny webs in low-lying vegetation and are unlikely to attract your notice until they are mature.
As they grow, spiderlings build increasingly larger webs at ever greater heights, until they reach maturity and construct their trademark two-foot diameter web between tree limbs, tall grasses or other suitably elevated, sunny location.
You have probably seen the webs of these spiders in the early morning, a multitude of delicate funnels in the grass, speckled with dew.
Ore weaver spiders are remarkable for the beautiful, complex webs they spin daily, each reaching up to two feet (60 cm) in diameter.
Rather than spinning webs, these catlike spiders stalk and pounce on their prey, their leaps reaching distances of up to 16 times their own length.
Many will damage the stem of the plant, the edge of the leaf, or leave webs behind like thin cotton threads.
You may also see devil contacts, reptilian styles, spider webs, gremlins, and more.
It seems that as long as Spidey keeps slinging his webs, there will continue to be new action figures for children and collectors to enjoy.
Butler Webs has an assortment of Christmas poems written by amateur poets who have volunteered to share their work.
Parker can cast webs, scale buildings with no help, swing through the sky on his webs, use superhuman strength and more.
The company's Campana flats feature "webs" of jelly straps that entwine their way all around the shoe, from the toe to the heel.
Webs are also a favorite detail many artists add to this type of design.
Spider Webs: Spider webs have a wide variety of meanings including the passage of time, in the form of a cobweb.
Spiders and spider webs were popular themes in Victorian times, as they were thought to bring luck to the quilter.
Add them to large flowerpots, then decorate with spider webs or silver balls if desired.
Use a hot plate to display bubbling green liquid (a little food coloring in water works wonders) and top it all off with some spider webs and a standup Frankenstein.
At the very least, you need some spider webs, pumpkins and cauldrons to hold your snacks.
A few fake webs around in the corners of the house with some very large plastic spiders would be a start.
That's what 50 Webs is counting on - that you'll like their service but begin to chafe under the limitations of size, of one email account, and decide to purchase one of their larger plans.
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Webs used to be known as Freewebs, but shortened the name when the shorter Domain name became available.
Tripod and Webs make money on the free services by selling ad space on your web page.
Along with all the same things offered by BraveNet, Webs also offers a web store that is linked with PayPal, a very popular Internet payment service.
With email lists and easy linking to the other 20 million sites on Webs, you can actually become quite connected.
Webs believes that everyone should have their home on the Internet, which they do by offering a free website maker for everyone to use.
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Almost all of the qualities that Webs features are included, and the sites are guaranteed to be friendly to search engines (unlike some Flash websites).
If your site is designed more around a theme or subject, a service such as Homestead or Webs might be appropriate (or a similar service using Flash known as Wix).
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The word usage examples above have been gathered from various sources to reflect current and historial usage. They do not represent the opinions of YourDictionary.com.