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English words and Examples of Usage

Example Sentences for "apertures"

-Separate single diaphragms must be avoided; a revolving plate pierced with different sized apertures and secured below the stage is preferable, but undoubtedly the best form is the "iris"[Pg 54] diaphragm (Fig.

The superfluous light from the mirror may be cut off by a screen having various-sized apertures placed below the stage; but the best mode of illumination is that proposed by Dr.

Beneath the stage is a circular revolving plate containing three apertures of various sizes, to limit the angle of the pencil of light which shall be allowed to fall on the object under examination.

The Glasses I used were of our English make, but though very good of the kind, yet far short of what might be expected, could we once find a way of making Glasses Elliptical, or of some more true shape; for though both Microscopes, and Telescopes, as they now are, will magnifie an Object about a thousand thousand times bigger then it appears to the naked eye; yet the Apertures of the Object-glasses are so very small, that very few Rays are admitted, and even of those few there are so many false, that the Object appears dark and indistinct: And indeed these inconveniences are such, as seem inseparable from Spherical Glasses, even when most exactly made; but the way we have hitherto made use of for that purpose is so imperfect, that there may be perhaps ten wrought before one be made tolerably good, and most of those ten perhaps every one differing in goodness one from means, uniting more Rays very near to one point, it does make many of those radiant points conspicuous, which, by putting on a less aperture, may be found to vanish; and therefore, both for the discovery of the fixt Star, and for finding the Satellites of Jupiter, before it be out of the day, or twilight, I alwayes leave the Object-glass as clear without any aperture as I can, and have thereby been able to discover the Satellites a long while before; I was able to discern them, when the smaller apertures were put on; and at other times, to see multitudes of other smaller Stars, which a smaller aperture makes to disappear.

These at length germinate, become articulated, and produce ovate or kidney-shaped spores, which in their turn germinate, penetrating the cuticle of the mother plant, avoiding the stomates or apertures by which it breathes.

With one of the side apertures a tube was connected, by means of which the air could be drawn slowly through the globe,[Pg 38] and into an apparatus in which its carbonic acid was accurately determined.

It is now no longer doubted that, whatever action the roots may exert, the constituents of the plant must be in solution before they can pass into it-experiment having distinctly shown that the spongioles or apertures through which this absorption takes place are too minute to admit even the smallest solid particle.

Portions of the spinal marrow pass through different apertures to all parts of the body.

It is provided with apertures which permit of the ascent of the gases in the interior of the cylinder.

These bed-dies are fitted to slide a little in opposite directions upon a suitable bed plate and are caused by the inclined cams, i', on the guides, i, of the press head (which pass through corresponding apertures in the bed-dies, h) to approach each other at the moment the punches come down on the work, so as to grip the lower web of the rod and support the pair of webs being operated on close up to the sides of the lower web lying in the space h', while when the punches rise the bed-dies move apart, so that the web is quite free in said space h' and the rod may be easily fed forward for a fresh stroke of the press.

Toward the two little gleams of light through apertures at the end of a passage beyond the nectary hairs, he at length finds his way.

We form joints and links of connexion, adapt large apertures to small, and thus dispense altogether with the aid of the brassfounder and the mechanist.

The entrance of the chamber and the two safety apertures in the roof having been closed by disks of paper fastened by paste, the gas is turned on until the desired percentage, has been introduced; the mixture of the air and gas takes merely a short time to effect by diffusion, the difference in density causing the gas to rise on issuing from the jet, which is on the floor of the chamber.

The dusky cloud-curtain was rent at intervals, and through the apertures thus formed parallel bars of extraordinary radiance escaped across the lake.



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