Naked-eye Sentence Examples

In front of the naked eye was held a piece of copper foil perforated by a fine needle hole.

Since that time nine novas have appeared, which have attained naked-eye visibility; and in recent years a number of very faint objects of the same class have been detected.

So long as the pupil of the observer alone undertakes the regulation of the rays there is no perceptible diminution of illumination in comparison with the naked eye vision.

The goggles will allow you to see so much more than the naked eye.

The reason a thermal imaging instrument helps when hunting ghosts is because it can "see" more than the naked eye.

Few persons can see with the naked eye - much less measure - more than six stars of the Pleiades, although all the stars measured by Maestlin have been seen with the naked eye by a few individuals of exceptional powers of eyesight.

These consist of enormous cells with nuclei so large as to be in some cases just visible to the naked eye.

A lenticel appears to the naked eye as a rounded or elongated scar, often forming a distinct prominence on the surface of the organ.

If the origin of light be treated as infinitely small, and be seen in focus, whether with the naked eye or with the aid of a telescope, the whole of the light in the absence of obstacles would be concentrated in the immediate neighbourhood of the focus.

The smallest and most numerous class are the telescopic meteors invisible to the naked eye.

The cercaria is just visible to the naked eye and has an oval or discoidal body and usually a long tail of variable form.

The faintest stars visible to the naked eye on clear nights are of about the sixth magnitude; exceptionally keen, well-trained eyes and clear moonless nights are necessary for the perception of stars of the seventh magnitude.

Numerous counts of the number of stars visible to the naked eye have been made; it is doubtful whether more than 2000 can be seen at one time from any position on the earth.

For the next ten years it slowly increased (though with slight check), and in 1843 was nearly as bright as Sirius; since then it has slowly faded, but it was not till 1869 that it ceased to be visible to the naked eye.

The results are given in his Prelimina, y General Catalogue (1910), which comprises the motions of 6188 stars fairly uniformly distributed over the sky, including all the stars visible to the naked eye.

Several estimates have been made which agree well together; whether direct use is made of known parallaxes, or comparison is made with binaries of well-determined orbits of the same spectral type as the sun, in which therefore it may be assumed there is the same relation between mass and brilliancy (Gore), the result is found that the sun's magnitude is - 26.5, or the sun is Io n times as brilliant as a first magnitude star; it would follow that the sun viewed from a Centauri would appear as of magnitude 0.7, and from a star of average distance which has a parallax certainly less than o 1 ", it would be at least fainter than the fifth magnitude, or, say, upon the border-line for naked-eye visibility.

These improvements were ignored or rejected by Johann Hevelius of Danzig, the author of the last important star-catalogue based solely upon naked-eye determinations.

Two phenomena presented by the moon are plain to the naked eye.

The magnification is also expressed as the ratio of the apparent size of the object observed through the microscope to the apparent size of the object seen with the naked eye.

As the conventional distance for clear vision with naked eye is 10 in., it results from fig.

A dusty envelope made the apparent brightness of the star to fade below the naked eye visibility.

White dwarfs are much too faint to be seen directly with the naked eye.

Very often the lens can capture a'moment ' too fleeting to be registered by the naked eye.

Although they are faint meteors, they can be seen with the naked eye and come in large numbers.

The planet should become observable to the naked eye in the morning sky from the commencement of the second week in September.

It does perhaps appear somewhat spotty to the naked eye but under a lens is clearly seen to be very hairy or scaled.

Here are the planets and some of their moons, all visible with a good telescope, some visible with a good telescope, some visible with the naked eye.

Before the invention of the telescope the accuracy of astronomical observations was necessarily limited by the angle that could be distinguished by the naked eye.

The movements of the pollen-masses may readily be seen with the naked eye by thrusting the point of a needle into the base of the anther, when the disks adhere to the needle as they would do to the antenna of an insect, and may be withdrawn.

To the left from that village, amid the smoke, was something resembling a battery, but it was impossible to see it clearly with the naked eye.

The whole French army, and even Napoleon himself with his staff, were not on the far side of the streams and hollows of Sokolnitz and Schlappanitz beyond which we intended to take up our position and begin the action, but were on this side, so close to our own forces that Napoleon with the naked eye could distinguish a mounted man from one on foot.

She explores the use of color, light and her photographic images reveal qualities often unseen by the naked eye.

Here are the planets and some of their moons, all visible with a good telescope, some visible with the naked eye.

Differing levels are difficult to discern the difference with the naked eye.

In these most have inclusions visible to the naked eye.

If the tank's been sitting for a long period of time, it could have damage that's not accessible to the naked eye.

One look at the brownie shade might turn some people off; it's quite dark to the naked eye.

Consider experimenting with different angles to make the moon appear larger to the naked eye.

This Moss (S. pennata) is so small that it would hardly be noticed by naked eye but for the iridescent gleams of beautiful color which it displays in suitable positions.

The naked eye cannot see through the shutters, and shutters as window and door coverings create the perfect private environment.

I1 - Blemishes and inclusions can be seen by the naked eye.

They make stargazing much more intense than just using the naked eye.

In many cases micro braids are so small, they are not noticed by the naked eye.

This type of head cover uses Swiss lace or French lace, each of which is invisible to the naked eye when placed against skin.

A moisture meter can detect accumulated moisture that may not be visible with the naked eye.

That's a pretty long route for things that aren't even visible to the naked eye.

Incredibly small, these bikinis leave the wearer's body completely visible to the naked eye.

The frequency of a wave of light is expressed to the naked eye as a color, so the tinting of your lenses has a direct effect on the kind of light they block out.

Infrared cooking is generated by infrared energy, which is simply a form of light that can't be seen with the naked eye.

Cubic zirconia is a popular synthetic diamond because if used properly, it cannot be distinguished from a real diamond by the naked eye.

High-quality lab created stones are indistinguishable from natural diamonds to the naked eye.

Naturals are impossible to see with the naked eye and very difficult to spot, even with a loupe.

These are not visible to the naked eye and are difficult to see at 10x magnification.

D-grade diamonds exhibit no color at all, while diamonds with color grades of G, H, and I have a faint color that cannot be detected by the naked eye.

It may have some surface blemishes, but they usually aren't visible to the naked eye.

These flaws are not visible to the naked eye.

These flaws may also be visible to the naked eye.

These diamonds have various sizes of inclusions, many of which are visible to the naked eye.

This is the only way you can really tell the two metals apart using the naked eye.

The openness of the cut clearly draws the naked eye to any visible blemishes.

However, there are also quality imitations that are nearly indistinguishable from real dark pearls to the naked eye unless viewed under a magnifying glass.

These inclusions would be difficult or impossible to see with the naked eye.

The logo and identification number are viewable through magnification with a jeweler's loupe, and are not readily visible to the naked eye so that it doesn't interfere with the design.

Sometimes they are able to capture something on film that is invisible to the naked eye.

However, many lifesaving professionals also wear white, blue, black and orange colored uniforms that are clearly visible to the naked eye.

As they watched, the figures in the dusty heat waves finally became recognizable as cavalry - even to the naked eye.

Since this shortsighted observer can view the object with the naked eye with no inconvenience to himself at 4 in.