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An instrument for measuring the acuteness of the sense of hearing. Itard.

An instrument for measuring and recording the variations in the actinic or chemical force of rays of light. Nichol.

An instrument for measuring the direct heating power of the sun's rays.

To bring to a true relative position, as the parts of an instrument; to regulate for use; as, to adjust a telescope or microscope.

The operation of bringing all the parts of an instrument, as a microscope or telescope, into their proper relative position for use; the condition of being thus adjusted; as, to get a good adjustment; to be in or out of adjustment.

An instrument for ascertaining the weight or density of air and gases.

An instrument, proposed by Edison, for greatly intensifying speech. It consists of a phonograph diaphragm so arranged that its action opens and closes valves, producing synchronous air blasts sufficient to operate a larger diaphragm with greater amplitude of vibration.

An instrument to measure the degree of sensation, by determining at how short a distance two impressions upon the skin can be distinguished, and thus to determine whether the condition of tactile sensibility is normal or altered.

An instrument consisting in part of a differential thermometer. It is used for measuring changes of temperature produced by different conditions of the sky, as when clear or clouded.

end to; to fix to any part of; as, to affix a syllable to a word; to affix a seal to an instrument; to affix one's name to a writing.

The faculty of acting or of exerting power; the state of being in action; action; instrumentality. The superintendence and agency of Providence in the natural world. Woodward.

An instrument for boring holes, used in blasting.

ingle voice to the stanzas of a hymn or song, or even to plain prose, or played upon an instrument; a melody; a tune; an aria.

An instrument for ascertaining the quantity of albumen in a liquid.

An instrument for determining the strength of spirits, with a scale graduated so as to indicate the percentage of pure alcohol, either by weight or volume. It is usually a form of hydrometer with a special scale.

An instrument for viewing pictures by means of a lens, so as to present them in their natural proportions and relations.

An instrument for determining the expansive properties, or quality, of gluten in flour. Knight.

An instrument for measuring sensations of pain due to pressure. It has a piston rod with a blunted tip which is pressed against the skin. -- Al*gom"e*try (#), n. -- Al`go*met"ric (#), *met"ric*al (#), a. --Al`go*met"ric*al*ly, adv.

The portion of a graduated instrument, as a quadrant or astrolabe, carrying the sights or telescope, and showing the degrees cut off on the arc of the instrument Whewell.

An instrument to ascertain the strength of alkalies, or the quantity of alkali in a mixture.