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e two axes of the hyperbola are the transverse axis and the conjugate axis. -- Axis of a lens, the straight line passing through its center and perpendicular to its surfaces. -- Axis of a telescope or microscope, the straight line with which coincide the axes of the several lenses which compose it. -- Axes of coördi…

beetle (Dermestes lardarius) which, especially in the larval state, feeds upon bacon, woolens, furs, etc. See Dermestes. -- To save one's bacon, to save one's self or property from harm or less. [Colloq.]

Convex on both sides; as, a biconvex lens.

Having two foci, as some spectacle lenses.

lantic, an important and abundant food fish on the coast of the United States, and (S. Chilensis) of the Pacific, and other related species. They are large and active fishes, of a blue color with black oblique stripes.

brakes; abounding with brambles, shrubs, or ferns; rough; thorny. In the woods and braky glens. W. Browne.

s, usually of double width (i.e., a yard and a half); -- so called in distinction from woolens three quarters of a yard wide.

A concave tool used in grinding lenses or the speculums of telescopes. Knight.

of air, or globular vacuum, in a transparent solid; as, bubbles in window glass, or in a lens.

A lantern, with a thick glass lens on one side for concentrating the light on any object; also, the lens itself. Dickens.

ne (camphine), but esp. a mixture of the latter with alcohol. -- Burning glass, a conxex lens of considerable size, used for producing an intense heat by converging the sun's rays to a focus. -- Burning house (Metal.), the furnace in which tin ores are calcined, to sublime the sulphur and arsenic from the pyrites. We…

ourt in camera. -- Panoramic, or Pantascopic, camera, a photographic camera in which the lens and sensitized plate revolve so as to expose adjacent parts of the plate successively to the light, which reaches it through a narrow vertical slit; -- used in photographing broad landscapes. Abney.

An apparatus in which the images of extermal objects, formed by a convex lens or a concave mirror, are thrown on a paper or other white surface placed in the focus of the lens or mirror within a darkened chamber, or box, so that the oulines may be traced.

A membranous sac containing fluid, or investing an organ or joint; as, the capsule of the lens of the eye. Also, a capsulelike organ.

Inflammation of a capsule, as that of the crystalline lens.

The incision of a capsule, esp. of that of the crystalline lens, as in a cataract operation.

ctive, which indicate its relation to other words, and in the aggregate constitute its declension; the relation which a noun or pronoun sustains to some other word. Case is properly a falling off from the nominative or first state of word; the name for which, however, is now, by extension of its signification, applied…

Dissolution; degeneration; decay. [R.] Sad catalysis and declension of piety. Evelyn.

An opacity of the crystalline lens, or of its capsule, which prevents the passage of the rays of light and impairs or destroys the sight.

A plant of the Parsley family (Apium graveolens), of which the blanched leafstalks are used as a salad.