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English words and Examples of Usage
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Sentences for "aperture"
The shape of the aperture is a not unimportant point; it should be square to allow of free movement over the substage[Pg 53] condenser.
45 whilst the aperture of the 1/12 inch immersion lenses of different makers varies from 1.
Three notches are made in one of the sides of the square and by moving the lever square aperture can be reduced to three-quarters, one-half or one-quarter of the original size.
-The numerical aperture may be defined, in general terms, as the ratio of the effective diameter of the back lens of the objective to its equivalent focal length.
This nosepiece, preferably constructed of aluminium, must be of the covered-in type, consisting of a curved plate attached to the lower end of the body tube-a circular aperture being cut to correspond to the lumen of that tube.
-This is an immersion substage condenser of high aperture by means of which unstained objects such as bacteria can be shown as bright white particles upon a dense black background.
It can be fitted inside the mount of any ocular just above the aperture of the diaphragm and must be adjusted exactly in the focus of the eye lens.
FOOTNOTES: [1] Its importance will be realised, however, when it is stated in the words of the late Professor Abbé: "The numerical aperture of a lens determines all its essential qualities; the brightness of the image increases with a given magnification and other things being equal, as the square of the aperture; the resolving and defining powers are directly related to it, the focal depth of differentiation of depths varies inversely as the aperture, and so forth.
Rack the condenser down slightly and cut down the aperture of the iris diaphragm so that the light, although even, is dim.
During sterilisation the air in the neck of the bottle, expanded by the heat, is driven out through the valvular aperture in the solid portion of the stopper.
At such times, however, a very small portion of gas passes from A to C, through an aperture inside the valve, the size of which aperture can be adjusted by the screw needle S, hence the gas flame below the incubator is never extinguished.
Slightly raise the lid of a sterile capsule, insert the mouth of the culture tube into the aperture and pour some of the cultivation into the capsule.
This method is especially useful when it is desired to collect samples of the peritoneal fluid from time to time during the period of observation, as fluid can be removed from the peritoneal cavity, at intervals, through this aperture in the abdominal parietes, by means of a sterile capillary pipette.
Withdraw the needle and press a pledget of cotton-wool over the puncture to ensure closure of the aperture in the vein wall.
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