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collodion on a negative, or a coat of varnish, may creep in drying; the quicksilver on a mirror may creep.

e a woman. Beau. & Fl. To dare larks, to catch them by producing terror through to use of mirrors, scarlet cloth, a hawk, etc., so that they lie still till a net is thrown over them. Nares.

An instrument for determining the time of apparent noon. It consists of two mirrors and a plane glass disposed in the form of a prism, so that, by the reflections of the sun's rays from their surfaces, two images are presented to the eye, moving in opposite directions, and coinciding at the instant the sun's center is…

or luster; not vivid; obscure; dim; as, a dull fire or lamp; a dull red or yellow; a dull mirror.

Divination by the use of a mirror.

eye end of a telescope or other optical instrument, through which the image formed by the mirror or object glass is viewed. Collimating eyepiece. See under Collimate. -- Negative, or Huyghenian, eyepiece, an eyepiece consisting of two plano-convex lenses with their curved surfaces turned toward the object glass, and s…

ging to,or concerning, a focus; as, a focal point. Focal distance, or length,of a lens or mirror (Opt.), the distance of the focus from the surface of the lens or mirror, or more exactly, in the case of a lens, from its optical center. --Focal distance of a telescope, the distance of the image of an object from the obj…

being reflected or refrcted, and at which the image is formed; as, the focus of a lens or mirror.

er sand or silica with lime, potash, soda, or lead oxide. It is used for window panes and mirrors, for articles of table and culinary use, for lenses, and various articles of ornament.

Mirror-faced; reflecting the sentiments of another. [R.] "The glass-faced flatterer." Shak.

Given to viewing one's self in a glass or mirror; finical. [Poetic] Shak.

, named from Prof. James Gregory, of Edinburgh, who perfected it in 1663. A small concave mirror in the axis of this telescope, having its focus coincident with that of the large reflector, transmits the light received from the latter back through a hole in its center to the eyepiece placed behind it. -- Gregorian yea…

ument for viewing the sun without injury to the eyes, as through colored glasses, or with mirrors which reflect but a small portion of light. -- He`li*o*scop`ic, a.

An instrument consisting of a mirror moved by clockwork, by which a sunbeam is made apparently stationary, by being steadily directed to one spot during the whole of its diurnal period; also, a geodetic heliotrope.

for making signals to an observer at a distance, by means of the sun's rays thrown from a mirror.

The European sand ray (Raia maculata); -- called also home, mirror ray, and rough ray.

nds with this line. Apparent horizon. See under Apparent. -- Artificial horizon, a level mirror, as the surface of mercury in a shallow vessel, or a plane reflector adjusted to the true level artificially; -- used chiefly with the sextant for observing the double altitude of a celestial body. -- Celestial horizon. (A…

The figure or picture of any object formed at the focus of a lens or mirror, by rays of light from the several points of the object symmetrically refracted or reflected to corresponding points in such focus; this may be received on a screen, a photographic plate, or the retina of the eye, and viewed directly by the eye…

L.] See Index prohibitorius (below). -- Index finger. See Index, 5. -- Index glass, the mirror on the index of a quadrant, sextant, etc. -- Index hand, the pointer or hand of a clock, watch, or other registering machine; a hand that points to something. -- Index of a logarithm (Math.), the integral part of the loga…

as, to infilm one metal with another in the process of gilding; to infilm the glass of a mirror. [R.]