Part 182

She of the open soul and open door, With room about her hearth for all mankind.

Lowell.

(b) In modern diplomacy, opportunity for political and commercial intercourse open to all upon equal terms, esp. with reference to a nation whose policy is wholly or partially fixed by nations foreign to itself, or to territory newly acquired by a conquering nation. In this sense, often used adjectively, as, open-door system, open-door policy, etc.

The steps taken by Britain to maintain the open door have so far proved to be perfectly futile.

A. R. Colquhoun.

Open-hearth steel. See under Open.

Open sea. (Internat. Law) A sea open to all nations. See Mare clausum.

Open verdict. (Law) A verdict on a preliminary investigation, finding the fact of a crime but not stating the criminal, or finding the fact of a violent death without disclosing the cause.

Oph"ism (?), n. 1. Doctrines and rites of the Ophites.

2. Serpent worship or the use of serpents as magical agencies.

||Op`ol*che"ni*e (?), n. [Russ., fr. opolchit' to make an army, polk army. Cf. Folk.] (Russia) See Army organization, above.

Op*tom"e*trist (?), n. One who is skilled in or practices optometry.

Op*tom"e*try (?), n. 1. (Med.) Measurement of the range of vision, esp. by means of the optometer.

2. As defined (with minor variations) in the statutes of various States of the United States: (a) "The employment of subjective and objective mechanical means to determine the accomodative and refractive states of the eye and the scope of its function in general." (b) "The employment of any means, other than the use of drugs, for the measurement of the powers of vision and adaptation of lenses for the aid thereof."

O"ri*ent, v. t. 1. Same as Orientate, 2.

2. To place (a map or chart) so that its east side, north side, etc., lie toward the corresponding parts of the horizon; specif. (Surv.), to rotate (a map attached to a plane table) until the line of direction between any two of its points is parallel to the corresponding direction in nature.

{ Or"mazd (?) or A`hu*ra-Maz"da }, n. [Zend Ahuramazda.] (Zoroastrianism) The supreme deity, the principle of good, creator of the world, and guardian of mankind. He is the opponent of Ahriman, the spirit of evil, both being sprung from Eternity, or, according to another version, Ahriman being the offspring of a moment of doubt on the part of Ormazd. Ormazd is attended by angels and archangels. He is represented as a bearded man inclosed in a winged circle, a conception probably derived from the Assyrian representations of Ashur.

Or"o*graph (?), n. [Gr. &?; mountain + -graph.] (Surveying) A machine for use in making topographical maps. It is operated by being pushed across country, and not only records distances, like the perambulator, but also elevations.

Or`o*he"li*o*graph (?), n. [Gr. &?; mountain + helio- + -graph.] (Photog.) A camera for obtaining a circular panoramic view of 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.

O*rom"e*ter (?), n. [Gr. &?; mountain + -meter.] (Meteor.) An aneroid barometer having a second scale that gives the approximate elevation above sea level of the place where the observation is made.

Or"tho*graph (?), n. [Ortho- + -graph.] (Arch.) An orthographic projection, sometimes partly in section, esp. of a building.

Os"cil*lat`ing current. (Elec.) A current alternating in direction.

Os"cil*la`tor (?), n. One that oscillates; specif.: (a) (Elec.) Any device for producing electric oscillations; esp., an apparatus for generating electric waves in a system of wireless telegraphy. (b) (Mech.) An instrument for measuring rigidity by the torsional oscillations of a weighted wire.

Os"cil*lo*gram (?), n. [L. oscillare + -gram.] (Elec.) An autographic record made by an oscillograph.

Os"cil*lo*graph (?), n. [L. oscillare to swing + -graph.] (Elec.) An apparatus for recording or indicating alternating-current wave forms or other electrical oscillations, usually consisting of a galvanometer with strong field, in which the mass of the moving part is very small and frequency of vibration very high. -- Os`cil*lo*graph"ic (#), a.

Os`cil*lom"e*ter (?), n. [L. oscillare to swing + -meter.] An instrument for measuring the angle through which a ship rolls or pitches at sea.

Os*cil"lo*scope (?), n. [L. oscillare to swing + -scope.] (Elec.) An instrument for showing visually the changes in a varying current; an oscillograph.

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