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Equatorial :: Equatorial (n.) An instrument consisting of a telescope so mounted as to have two axes of motion at right angles to each other, one of them parallel to the axis of the earth, and each carrying a graduated circle, the one for measuring declination, and the other right ascension, or the hour angle, so that the telescope may be directed, even in the daytime, to any star or other object whose right ascension and declination are known. The motion in right ascension is sometimes communicated by clockw

Virginal :: Virginal (n.) An instrument somewhat resembling the spinet, but having a rectangular form, like the small piano. It had strings and keys, but only one wire to a note. The instrument was used in the sixteenth century, but is now wholly obsolete. It was sometimes called a pair of virginals..

Charger :: Charger (n.) An instrument for measuring or inserting a charge.

Needle :: Needle (n.) A slender rod or wire used in knitting; a knitting needle; also, a hooked instrument which carries the thread or twine, and by means of which knots or loops are formed in the process of netting, knitting, or crocheting..

Lithotripsy :: Lithotripsy (n.) The operation of crushing a stone in the bladder with an instrument called lithotriptor or lithotrite; lithotrity.

Voltmeter :: Voltmeter (n.) An instrument for measuring in volts the differences of potential between different points of an electrical circuit.

File :: File (n.) A steel instrument, having cutting ridges or teeth, made by indentation with a chisel, used for abrading or smoothing other substances, as metals, wood, etc..

Vaporimeter :: Vaporimeter (n.) An instrument for measuring the volume or the tension of any vapor; specifically, an instrument of this sort used as an alcoholometer in testing spirituous liquors..

Eriometer :: Eriometer (n.) An instrument for measuring the diameters of minute particles or fibers, from the size of the colored rings produced by the diffraction of the light in which the objects are viewed..

Evaporometer :: Evaporometer (n.) An instrument for ascertaining the quantity of a fluid evaporated in a given time; an atmometer.

Swinglebar :: Swingle (n.) A wooden instrument like a large knife, about two feet long, with one thin edge, used for beating and cleaning flax; a scutcher; -- called also swingling knife, swingling staff, and swingling wand..

Quintette :: Quintette (n.) A composition for five voices or instruments; also, the set of five persons who sing or play five-part music..

Violin :: Violin (n.) A small instrument with four strings, played with a bow; a fiddle..

Director :: Director (n.) A part of a machine or instrument which directs its motion or action.

Sprayboard :: Spray (v. t.) To throw spray upon; to treat with a liquid in the form of spray; as, to spray a wound, or a surgical instrument, with carbolic acid..

Heliotrope :: Heliotrope (n.) An instrument for making signals to an observer at a distance, by means of the sun's rays thrown from a mirror..

Cranioclast :: Cranioclast (n.) An instrument for crushing the head of a fetus, to facilitate delivery in difficult eases..

Polarimeter :: Polarimeter (n.) An instrument for determining the amount of polarization of light, or the proportion of polarized light, in a partially polarized ray..

Scissible :: Scissible (a.) Capable of being cut or divided by a sharp instrument.

Sounder :: Sounder (n.) One who, or that which; sounds; specifically, an instrument used in telegraphy in place of a register, the communications being read by sound..

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