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tube having one end open and the other 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 singin…

A mamber of a Gnostic serpent-worshiping sect of the second century.

Concave behind; -- applied especially to vertebræ in which the anterior end of the centrum is convex and the posterior concave.

sometimes called binocular parallax. -- Optic axis. (Opt.) (a) A line drawn through the center of the eye perpendicular to its anterior and posterior surfaces. In a normal eye it is in the direction of the optic axis that objects are most distinctly seen. (b) The line in a doubly refracting crystal, in the direction…

The opinions of Origen of Alexandria, who lived in the 3d century, one of the most learned of the Greek Fathers. Prominent in his teaching was the doctrine that all created beings, including Satan, will ultimately be saved.

upposed to be placed at an infinite distance, the plane of projection passing through the center of the sphere perpendicularly to the line of sight.

he extreme points of the oscillation were not very remote. Macaulay. Axis of oscillation, Center of oscillation. See under Axis, and Center.

ther from the interior, from a given station, or from any space or position regarded as a center or starting place; -- opposed to inner; as, the outer wall; the outer court or gate; the outer stump in cricket; the outer world. Outer bar, in England, the body of junior (or utter) barristers; -- so called because in cour…

Lying or being at a distance from the central part, or the main body; being on, or beyond, the frontier; exterior; remote; detached.

A part remote from the center; outer edge; border; -- usually in the plural; as, the outskirts of a town. Wordsworth. The outskirts of his march of mystery. Keble.

A street remote from the center of a town. Johnson.

hol than proof spirit; stronger than proof spirit; that is, containing more than 49.3 per cent by weight of alcohol.

A believer in the theory (called encasement theory), current during the last century, that the egg was the real animal germ, and that at the time of fecundation the spermatozoa simply gave the impetus which caused the unfolding of the egg, in which all generations were inclosed one within the other. Also called ovist.…

ous element occurring in the free state in the atmosphere, of which it forms about 23 per cent by weight and about 21 per cent by volume, being slightly heavier than nitrogen. Symbol O. Atomic weight 15.96.

A high and narrow tank, with a central cylinder for the introduction of compressed air, used in the agitation and settling of pulp (pulverized ore and water) during treatment by the cyanide process; -- so named because, though originally devised in New Zealand, it was first practically introduced in Pachuca, Mexico.…

Of, pertaining to, or discovered by, Filippo Pacini, an Italian physician of the 19th century.

Belonging to, or connected with, ancient art. "The paleotechnic men of central France." D. Wilson.

g, or of the nature of, a kind of pottery made by Bernard Palissy, in France, in the 16th centry. Palissy ware, glazed pottery like that made by Bernard Palissy; especially, that having figures of fishes, reptiles, etc., in high relief.

f architecture, founded on the works of Andrea Palladio, an Italian architect of the 16th century.

A centipede.