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Straighted :: Straightedge (n.) A board, or piece of wood or metal, having one edge perfectly straight, -- used to ascertain whether a line is straight or a surface even, and for drawing straight lines..

Ophthalmometer :: Ophthalmometer (n.) An instrument devised by Helmholtz for measuring the size of a reflected image on the convex surface of the cornea and lens of the eye, by which their curvature can be ascertained..

Hypsometer :: Hypsometer (n.) An instrument for measuring heights by observation of barometric pressure; esp., one for determining heights by ascertaining the boiling point of water. It consists of a vessel for water, with a lamp for heating it, and an inclosed thermometer for showing the temperature of ebullition..

Measuring :: Measuring (a.) Used in, or adapted for, ascertaining measurements, or dividing by measure..

Voir Dire :: Voir dire () An oath administered to a witness, usually before being sworn in chief, requiring him to speak the truth, or make true answers in reference to matters inquired of, to ascertain his competency to give evidence..

Oleometer :: Oleometer (n.) An instrument for ascertaining the weight and purity of oil; an elaiometer.

Reference :: Reference (n.) The process of sending any matter, for inquiry in a cause, to a master or other officer, in order that he may ascertain facts and report to the court..

Tribometer :: Tribometer (n.) An instrument to ascertain the degree of friction in rubbing surfaces.

Plumb :: Plumb (v. t.) To sound with a plumb or plummet, as the depth of water; hence, to examine by test; to ascertain the depth, quality, dimension, etc.; to sound; to fathom; to test..

Gravimeter :: Gravimeter (n.) An instrument for ascertaining the specific gravity of bodies.

Datable :: Datable (a.) That may be dated; having a known or ascertainable date.

Calibrate :: Calibrate (v. i.) To ascertain the caliber of, as of a thermometer tube; also, more generally, to determine or rectify the graduation of, as of the various standards or graduated instruments..

Divide :: Divide (v. t.) To separate into two parts, in order to ascertain the votes for and against a measure; as, to divide a legislative house upon a question..

Spyboat :: Spy (n.) A person sent secretly into an enemy's camp, territory, or fortifications, to inspect his works, ascertain his strength, movements, or designs, and to communicate such intelligence to the proper officer..

Prove :: Prove (v. t.) To test, evince, ascertain, or verify, as the correctness of any operation or result; thus, in subtraction, if the difference between two numbers, added to the lesser number, makes a sum equal to the greater, the correctness of the subtraction is proved..

Gauge :: Gauge (n.) Any instrument or apparatus for measuring the state of a phenomenon, or for ascertaining its numerical elements at any moment; -- usually applied to some particular instrument; as, a rain gauge; a steam gauge..

Leveling :: Leveling (n.) The art or operation of using a leveling instrument for finding a horizontal line, for ascertaining the differences of level between different points of the earth's surface included in a survey, for establishing grades, etc., as in finding the descent of a river, or locating a line of railroad..

Indigometer :: Indigometer (n.) An instrument for ascertaining the strength of an indigo solution, as in volumetric analysis..

Albuminimeter :: Albuminimeter (n.) An instrument for ascertaining the quantity of albumen in a liquid.

Calculate :: Calculate (v. i.) To ascertain or determine by mathematical processes, usually by the ordinary rules of arithmetic; to reckon up; to estimate; to compute..

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