A good compound condenser for ordinary work is that proposed by Herschel, consisting of a biconvex lens and a meniscus mounted together with the concave side of the meniscus next the light.
The lenses e and g are also termed meniscus lenses, and a represents a prism.
Spherical aberration, however, may be entirely destroyed by combining a meniscus and double convex lens, as shown in Fig.
Half the lens is imbedded in the cavity of the retina and surrounded by the pigment, and the other half is turned toward a concavo-convex meniscus which corresponds in position with the cornea.
The refractive parts consist of a convex-concave meniscus in front, and a spherical lens behind, adjoining the concave side of the meniscus.
The development of the meniscus and lens is unknown, but the retina is formed (fig.
The long semi-circular wall of precipice which, sweeping inwards at the bottom of the bay, leaves to the inhabitants between its base and the beach their fertile meniscus of land, here abuts upon the coast.
In spite of its extreme lightness, however, it is easily seen, has a well-defined meniscus and drops well.
A Kodak Junior, with meniscus achromatic lens and Kodak Ball Bearing shutter $ 9.
It is fitted with our Pocket Automatic shutter working for time, bulb and snap-shot exposures, in which is mounted an excellent meniscus lens.
For average photography, the camera fitted with Kodak Ball Bearing shutter and tested meniscus achromatic lens is amply efficient, for it will make excellent pictures under ordinary conditions.
The camera is furnished with either meniscus achromatic or rapid rectilinear lens.
Ball Bearing shutter, speed 1/50 of a second, with cable release, as described on page 6, and offers the choice of rapid rectilinear or meniscus achromatic lens.
The articular cartilage of the lateral condyle and the lateral meniscus are usually thickened.
Tenderness may be elicited on making pressure to the medial side of the ligamentum patellæ in the groove between the femur and the tibia, but the meniscus cannot be recognised by palpation.
In a large proportion of cases of displaced meniscus in which the condition assumes the recurrent type, it is found, on opening the joint, that, in addition to being unduly mobile, the meniscus is torn or lacerated.
In one case we found the meniscus separated at both ends and lying between the bones and the capsule.
The return of the meniscus to its place is sometimes attended with a distinct snap, but in other cases reduction is only recognised to have taken place by the fact that the joint can be completely extended without causing pain.
The tendon of the popliteus muscle intervenes between the lateralmeniscus and the capsule.
In the majority of cases, however, the best results are obtained by opening the joint and excising the meniscus in whole or in part, as may be necessary.
Sometimes the meniscus is split from end to end, the outer crescent remaining in position, while the inner crescent passes in between the condyles and lies curled up against the cruciate ligaments.
It is convenient to consider these "internal derangements of the knee-joint" separately, according to whether the meniscus is merely abnormally mobile, or is actually torn.
Attempts may be made to retain the meniscusin position by pads, bandages, or other forms of apparatus, so arranged as to prevent rotation and side-to-side movement at the knee.
Cautiously admit a little air by releasing the pressure of the finger, and allow the level of the water to fall until the lowest point of the meniscus is level with the graduation.
Cool to laboratory temperature, and fill the flask with distilled water until the lowest point of the meniscus is exactly level with the mark on the neck of the flask.
The student should observe by trial how a reading is affected when the meniscus is viewed from above or below.
Fill the burette to a point above the zero-point and draw off the water until the meniscus is just below that mark.
Hold the paper about two small divisions below the meniscus and raise or lower the level of the eyes until the edge of the paper at the back of the burette is just hidden from the eye by that in front (Note 2).
Note 2: Other methods are employed which involve the use of calibrated apparatus from which the desired volume of water may be run into the dry flask and the position of the meniscus marked directly upon it.
It is not well to attempt to bring the meniscus exactly to a division mark on the burette.
The solution has so deep a color that the lower line of the meniscus cannot be detected; readings must therefore be made from the upper edge.
In order to obtain an accurate result, the meniscus should be removed.
The curved meniscus which always forms at the top of the fat column should be included in the reading.
For the single lens fitting only meniscus achromatic lenses which have stood rigid tests are used, and the same is true of the double lens equipment where our standard Planatograph lenses are fitted in each case.
In addition to the double lens fittings these cameras are also offered with single meniscus achromatic lenses for those who prefer compact folding cameras requiring but little adjustment of focus for objects at different distances.
The meniscus lens has but a very slightly dispersive power, and the concavo-convex merely separates the parallel rays to the thickness of the lens and sends them on parallel as they entered.
This lens consists of two cemented combinations, each composed of a deep meniscus crown and a deep concavo-convex flint glass lens.
Spherical aberration is overcome to a great extent by the use (in connection with the double convex) of a meniscus lens.
Sometimes, as in the Ornithorhynchus, the meniscus is absent.
This gliding movement between the meniscus and temporal bone may be separately brought about by protruding the lower teeth in front of the upper, or, on one side only, by moving the jaw across to the opposite side.
On first opening the mouth, the joint acts as a hinge, but very soon the condyle begins to glide forward on to the eminentia articularis (see SKULL) and takes the meniscus with it.
The upper part of the capsule is strongest, and from it hangs down a partial meniscus into the cavity.
Cundell suggested that two meniscus lenses should be used in combination, one on either side of the stop, as in Fig 115.
The liquid is then adjusted until its meniscus rests at the zero point on the left.
The tops of the sliding pieces extending across the tubes are placed at the bottom of the meniscus and accurate readings in hundredths of an inch are obtained by a vernier.
Under these circumstances, a rise of level of one inch in the right-hand vertical tube causes the meniscus in the inclined tube to pass from the point 0 to 1.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "meniscus" in a variety of sentences. We hope that you will now be able to make sentences using this word.
