noun
definition
An optical instrument used for observing small objects.
definition
Any instrument for imaging very small objects (such as an electron microscope).
verb
definition
To examine with a microscope, to put under a microscope (literally or figuratively).
synonyms
Examples of microscope in a Sentence
Under the microscope the ovary is seen to be covered by a FIG.
In polarized light they show a weak grey colour with a black cross, the arms of which are parallel to the cobwebs in the eyepiece of the microscope and remain stationary when the section is rotated.
The plant can then be at any time examined under the microscope without injuring the mounted specimen.
The microscopes adjoining 82 read the position and declination circles; for, by an ingenious arrangement of prisms and screens, the images of both circles can be read by each single microscope as shown in fig.
It consists of a definite contractile sac or sacs lying on the dorsal side of the alimentary canal near the oesophagus, and in preparations of Terebratulina made by quickly removing the viscera and examining them in sea-water under a microscope, he was able to count the pulsations, which followed one another at intervals of 30-40 seconds.
In some solutions they are visible under a good microscope.
What one sees under the microscope is much better than the photographic image.
A special microscope is introduced for determining the division errors of the scales.
The magnification, resulting from the simple microscope of i in.
So in the microscope there is nothing except lack of light to hinder the visibility of an object however small.
The simple microscope is subject to either limitation.
The microscope or viewing telescope is fitted with a spider-line micrometer having two screws at right angles to each other, by means of which readings can be made first on one reseau-line, then on the star, and finally on the opposite reseau-line in both co-ordinates.
The Doctor is a microscope Transformer that contains tools.
Instead of a mirror, the objective of a microscope is attached to one prong of the first fork and the eyepiece of the microscope is fixed behind the fork.
The microscope shows that the neighbouring filaments are held together by patches of cilia, called " ciliated junctions," which interlock with one another just as two brushes may be made to do.
It is, like milk, an emulsion, and when examined with the microscope is seen to consist of numerous globules suspended in a watery fluid.
A comparison with the method of a material pointer, attached to the parts whose rotation is under observation, and viewed through a microscope, is of interest.
In fact the uniformity of brass and bell-metal is only superficial; if we adopt the methods described in the article Metallography, and if, after polishing a plane face on a bit of gun-metal, we etch away the surface layer and examine the new surface with a lens or a microscope, we find a complex pattern of at least two materials.
At that time the " compass " microscope was in use.
From this it appears that each observer obtains specific advantages from one and the same simple microscope, and also the individual observer can obtain different magnifications by either using different accommodations, or by viewing in passive accommodation.
Constitution of Iron and Steel.-The constitution of the various classes of iron and steel as shown by the microscope explains readily the great influence of carbon which was outlined in §§ 2 and 3.
Some species are minute filamentous plants, requiring the microscope for their detection; others, like Lessonia, are of considerable bulk, or, like Macrocystis, of enormous length.
In point of size the largest cannot rival the larger Brown Algae, while the majority require the aid of the microscope for their investigation.
These passages certainly prove that Bacon had very nearly, if not perfectly, arrived at theoretical proof of the possibility of constructing a telescope and a microscope; but his writings give no account of the trial of an actual telescope, nor any detailed results of the application of a telescope to an examination of the heavens.
If we now attach to the polar axis a graduated circle D D, called the" hour circle,"of which the microscope or vernier R reads o h when the declination axis is horizontal, we can obviously read off the hour angle from the meridian of any star to which the telescope may be directed at the instant of observation.
This investigation is also memorable because he detected the minute sugar-crystals in the roots by the help of the microscope, which was thus introduced as an adjunct to chemical inquiry.
Any divergence or collapse of the gold-leaf can be viewed by a microscope through an aperture in the side of the case.
If then the strip of gold-leaf is raised or lowered in potential it moves to or from the plate P, and its movement can be observed by a microscope through a hole in the side of the box.
Several green-coloured beetles are, on account of their colour, used as adulterants to cantharides, but they are very easily detected by examination with the eye, or, if powdered, with the microscope.
The micro-organism giving rise to this disease generally appears in the form of small jointed rods and tangled masses under the microscope.
Abbe succeeded in computing microscope objectives free from error of the axis point and satisfying the sine condition for several colours, which therefore, according to his definition, were " aplanatic for several colours "; such systems he termed " apochromatic."
This Is Produced In The Same Amount, But In The Opposite Sense, By The Oculars, Which Are Used With These Objectives (" Compensating Oculars "), So That It Is Eliminated In The Image Of The Whole Microscope.
The Best Telescope Objectives, And Photographic Objectives Intended For Three Colour Work, Are Also Apochromatic, Even If They Do Not Possess Quite The Same Quality Of Correction As Microscope Objectives Do.
The fungus is very small in size, and under the microscope appears slightly whitish or colourless.
Until about 1725 the belief was very prevalent that cochineal was the seed of a plant, but Dr Martin Lister in 1672 conjectured it to be a kind of kermes, and in 1703 Antony van Leeuwenhoek ascertained its true nature by aid of the microscope.
The presence in the root of starch, resin and oxalate of lime is revealed by the use of the microscope.
The microscope magnifies the distance traversed as well as the organism, and although a bacterium which covers 9 - ro cm.
The process is of course observed by means of the microscope, but the clumps soon settle in the fluid and ultimately form a sediment, leaving the upper part clear.
The discovery of the microscope carried the refutation further.
In "frilling" or "frilled structure" the folds have still smaller amplitude, and in many highly corrugated rocks minute folds are observable with the microscope that do not appear to the unaided eye.
The invention of the microscope, attributed to Galileo by his first biographer, Vincenzio Viviani, does not in truth belong to him.
Such an instrument was made as early as 1590 by Zacharias Jansen of Middleburg; and although Galileo discovered, in 1610, a means of adapting his telescope to the examination of minute objects, he did not become acquainted with the compound microscope until 1624 when he saw one of Drebbel's instruments in Rome, and, with characteristic ingenuity, immediately introduced some material improvements into its construction.
The compound microscope generally consists of two positive lens systems, so arranged that the system nearer the object (termed the objective) projects a real enlarged image, which occupies the same place relatively to the second system (the eyepiece or ocular) as does the real object in the simple microscope.
Convex glass lenses were first generally used to assist ordinary vision as " spectacles "; and not only were spectacle-makers the first to produce glass magnifiers (or simple microscopes), but by them also the telescope and the compound microscope were first invented.
During the Thirty Years' War the simple microscope was widely known.
Antony van Leeuwenhoek appears to be the first to succeed in grinding and polishing lenses of such short focus and perfect figure as to render the simple microscope a better instrument for most purposes than any compound microscope then constructed.
Early opticians and microscopists gave their chief attention to the improvement of the simple microscope, the principle of which we now explain.
When the details are no longer recognizable by the unaided eye, the magnifying glass or the simple microscope is necessary.
As a rule large magnification is not demanded from the former, but a larger field of view, whilst the simple microscope should ensure powerful magnification even when the field is small.
The simple microscope enlarges the angle of vision, and does not tire the eye when it is arranged so that the image lies in the farthest limit of distinct vision (the punctum remotum).