Search the Dictionary

An instrument, consisting of an arrangement of two mirrors, for reflecting light upon the larynx, and for examining its image.

A concave metallic mirror attached to the object-glass end of a microscope, to throw down light on opaque objects; a reflector.

A mirror made of glass on which has been placed a backing of some reflecting substance, as quicksilver. There is none so homely but loves a looking-glass. South.

peed engines. It consists of a light-tight box or camera having at one end a small convex mirror which reflects a beam of light on to the ground glass or photographic plate at the other end. The mirror is pivoted so that it can be moved in one direction by a small plunger operated by an elastic metal diaphragm which cl…

issue. -- Milk meats, food made from milk, as butter and cheese. [Obs.] Bailey. -- Milk mirror. Same as Escutcheon, 2. -- Milk molar (Anat.), one of the deciduous molar teeth which are shed and replaced by the premolars. -- Milk of lime (Chem.), a watery emulsion of calcium hydrate, produced by macerating quicklime…

-- Mouth friend, one who professes friendship insincerely. Shak. -- Mouth glass, a small mirror for inspecting the mouth or teeth. -- Mouth honor, honor given in words, but not felt. Shak. -- Mouth organ. (Mus.) (a) Pan's pipes. See Pandean. (b) An harmonicon. -- Mouth pipe, an organ pipe with a lip or plate to cut…

.), a reflecting telescope, in which rays from the large speculum are received by a plane mirror placed diagonally in the axis, and near the open end of the tube, and thrown at right angles toward one side of the tube, where the image is formed and viewed through the eyeplace. -- Newtonian theory of light. See Note un…

her end covered with a thin flexible membrance to the center of which is attached a small mirror. It is used for exhibiting upon a screen, by means of rays reflected from the mirror, the vibratory motions caused by sounds produced at the open end of the tube, as by speaking or singing into it. A. E. Dolbear.…

ewing the interior of the eye, particularly the retina. Light is thrown into the eye by a mirror (usually concave) and the interior is then examined with or without the aid of a lens. -- Oph*thal`mo*scop"ic, a.

yepiece, suspended vertically in gimbals by the object end beneath a fixed diagonal plane mirror. It is used for delineating landscapes, by means of a pencil at the eye end which leaves the delineation on paper.

the horizon. The photographic plate is placed horizontally with a vertical lens above. A mirror of peculiar shape reflects light from the entire horizon to the lens, by means of which it is focused upon the plate.

An instrument for measuring thickness, as of the glass of a mirror, or of paper; a pachymeter.

id, a paraboloid; a conoid whose directing curve is a parabola. See Conoid. -- Parabolic mirror (Opt.), a mirror having a paraboloidal surface which gives for parallel rays (as those from very distant objects) images free from aberration. It is used in reflecting telescopes. -- Parabolic spindle, the solid generated…

A glass through which objects are viewed. [Obs.] "Not a perspective, but a mirror." Sir T. Browne.

pier which by its strength and stability resists the thrust of an arch. -- Pier glass, a mirror, of high and narrow shape, to be put up between windows. -- Pier table, a table made to stand between windows.

An opera glass or field glass with an oblique mirror arranged for seeing objects do not lie directly before the eye; -- called also diagonal, or side, opera glass.

The degree to which a lens, mirror, or any optical instrument, magnifies; in the telescope, and usually in the microscope, the number of times it multiplies, or augments, the apparent diameter of an object; sometimes, in microscopes, the number of times it multiplies the apparent surface.

having a graduated scale upon its arc, and an index arm, or alidade pivoted at its apex. Mirrors, called the index glass and the horizon glass, are fixed one upon the index arm and the other upon one side of the frame, respectively. When the instrument is held upright, the index arm may be swung so that the index glas…

To bend back; to give a backwaas, a mirror reflects rays of light; polished metals reflect heat. Let me mind the reader to reflect his eye on our quotations. Fuller. Bodies close together reflect their own color. Dryden.

Throwing back light, heat, etc., as a mirror or other surface.