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Sextant :: Sextant (n.) An instrument for measuring angular distances between objects, -- used esp. at sea, for ascertaining the latitude and longitude. It is constructed on the same optical principle as Hadley's quadrant, but usually of metal, with a nicer graduation, telescopic sight, and its arc the sixth, and sometimes the third, part of a circle. See Quadrant..

Extant :: Extant (a.) Still existing; not destroyed or lost; outstanding.

Gest :: Gest (n.) A roll recting the several stages arranged for a royal progress. Many of them are extant in the herald's office.

Forestaff :: Forestaff (n.) An instrument formerly used at sea for taking the altitudes of heavenly bodies, now superseded by the sextant; -- called also cross-staff..

Vernier :: Vernier (n.) A short scale made to slide along the divisions of a graduated instrument, as the limb of a sextant, or the scale of a barometer, for indicating parts of divisions. It is so graduated that a certain convenient number of its divisions are just equal to a certain number, either one less or one more, of the divisions of the instrument, so that parts of a division are determined by observing what line on the vernier coincides with a line on the instrument..

Capybara :: Capybara (n.) A large South American rodent (Hydrochaerus capybara) Living on the margins of lakes and rivers. It is the largest extant rodent, being about three feet long, and half that in height. It somewhat resembles the Guinea pig, to which it is related; -- called also cabiai and water hog..

Macrometer :: Macrometer (n.) An instrument for determining the size or distance of inaccessible objects by means of two reflectors on a common sextant.

Sextant :: Sextant (n.) The sixth part of a circle.

Cunabula :: Cunabula (n. pl.) The extant copies of the first or earliest printed books, or of such as were printed in the 15th century..

Radius :: Radius (n.) The movable limb of a sextant or other angular instrument.

Octant :: Octant (n.) An instrument for measuring angles (generally called a quadrant), having an arc which measures up to 9O�, but being itself the eighth part of a circle. Cf. Sextant..

Divide :: Divide (v. t.) To mark divisions on; to graduate; as, to divide a sextant..

Observation :: Observation (n.) Specifically, the act of measuring, with suitable instruments, some magnitude, as the time of an occultation, with a clock; the right ascension of a star, with a transit instrument and clock; the sun's altitude, or the distance of the moon from a star, with a sextant; the temperature, with a thermometer, etc..

Fathom :: Fathom (n.) The measure or extant of one's capacity; depth, as of intellect; profundity; reach; penetration..

Extant :: Extant (a.) Publicly known; conspicuous.

Extant :: Extant (a.) Standing out or above any surface; protruded.

Altimeter :: Altimeter (n.) An instrument for taking altitudes, as a quadrant, sextant, etc..

Sextant :: Sextant (n.) The constellation Sextans.

Liriodendron :: Liriodendron (n.) A genus of large and very beautiful trees of North America, having smooth, shining leaves, and handsome, tuliplike flowers; tulip tree; whitewood; -- called also canoewood. Liriodendron tulipifera is the only extant species, but there were several others in the Cretaceous epoch..

Backstaff :: Backstaff (n.) An instrument formerly used for taking the altitude of the heavenly bodies, but now superseded by the quadrant and sextant; -- so called because the observer turned his back to the body observed..

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