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Double refraction micrometerMicrometer Mi*crom"e*ter, n. [Micro- + -meter: cf. F.
microm[`e]tre.]
An instrument, used with a telescope or microscope, for
measuring minute distances, or the apparent diameters of
objects which subtend minute angles. The measurement given
directly is that of the image of the object formed at the
focus of the object glass.
Circular, or Ring, micrometer, a metallic ring fixed in
the focus of the object glass of a telescope, and used to
determine differences of right ascension and declination
between stars by observations of the times at which the
stars cross the inner or outer periphery of the ring.
Double image micrometer, a micrometer in which two images
of an object are formed in the field, usually by the two
halves of a bisected lens which are movable along their
line of section by a screw, and distances are determined
by the number of screw revolutions necessary to bring the
points to be measured into optical coincidence. When the
two images are formed by a bisected object glass, it is
called a divided-object-glass micrometer, and when the
instrument is large and equatorially mounted, it is known
as a heliometer.
Double refraction micrometer, a species of double image
micrometer, in which the two images are formed by the
double refraction of rock crystal.
Filar, or Bifilar, micrometer. See under Bifilar.
Micrometer caliper or gauge (Mech.), a caliper or gauge
with a micrometer screw, for measuring dimensions with
great accuracy.
Micrometer head, the head of a micrometer screw.
Micrometer microscope, a compound microscope combined with
a filar micrometer, used chiefly for reading and
subdividing the divisions of large astronomical and
geodetical instruments.
Micrometer screw, a screw with a graduated head used in
some forms of micrometers.
Position micrometer. See under Position.
Scale, or Linear, micrometer, a minute and very
delicately graduated scale of equal parts used in the
field of a telescope or microscope, for measuring
distances by direct comparison. Index of refraction 3. A table for facilitating reference to topics, names, and
the like, in a book; -- usually alphabetical in
arrangement, and printed at the end of the volume.
4. A prologue indicating what follows. [Obs.] --Shak.
5. (Anat.) The second digit, that next pollex, in the manus,
or hand; the forefinger; index finger.
6. (Math.) The figure or letter which shows the power or root
of a quantity; the exponent. [In this sense the plural is
always indices.]
Index error, the error in the reading of a mathematical
instrument arising from the zero of the index not being in
complete adjustment with that of the limb, or with its
theoretically perfect position in the instrument; a
correction to be applied to the instrument readings equal
to the error of the zero adjustment.
Index expurgatorius. [L.] See Index prohibitorius
(below).
Index finger. See Index, 5.
Index glass, the mirror on the index of a quadrant,
sextant, etc.
Index hand, the pointer or hand of a clock, watch, or other
registering machine; a hand that points to something.
Index of a logarithm (Math.), the integral part of the
logarithm, and always one less than the number of integral
figures in the given number. It is also called the
characteristic.
Index of refraction, or Refractive index (Opt.), the
number which expresses the ratio of the sine of the angle
of incidence to the sine of the angle of refraction. Thus
the index of refraction for sulphur is 2, because, when
light passes out of air into sulphur, the sine of the
angle of incidence is double the sine of the angle of
refraction.
Index plate, a graduated circular plate, or one with
circular rows of holes differently spaced; used in
machines for graduating circles, cutting gear teeth, etc.
Index prohibitorius [L.], or Prohibitory index (R. C.
Ch.), a catalogue of books which are forbidden by the
church to be read; the index expurgatorius [L.], or
expurgatory index, is a catalogue of books from which
passages marked as against faith or morals must be removed
before Catholics can read them. These catalogues are
published with additions, from time to time, by the
Congregation of the Index, composed of cardinals,
theologians, etc., under the sanction of the pope. --Hook.
Index rerum [L.], a tabulated and alphabetized notebook,
for systematic preservation of items, quotations, etc. Refracted
Refracted Re*fract"ed, a.
1. (Bot. & Zo["o]l.) Bent backward angularly, as if
half-broken; as, a refracted stem or leaf.
2. Turned from a direct course by refraction; as, refracted
rays of light.
Refracted visionVision Vi"sion, n. [OE. visioun, F. vision, fr. L. visio, from
videre, visum, to see: akin to Gr. ? to see, ? I know, and E.
wit. See Wit, v., and cf. Advice, Clairvoyant, Envy,
Evident, Provide, Revise, Survey, View, Visage,
Visit.]
1. The act of seeing external objects; actual sight.
Faith here is turned into vision there. --Hammond.
2. (Physiol.) The faculty of seeing; sight; one of the five
senses, by which colors and the physical qualities of
external objects are appreciated as a result of the
stimulating action of light on the sensitive retina, an
expansion of the optic nerve.
3. That which is seen; an object of sight. --Shak.
4. Especially, that which is seen otherwise than by the
ordinary sight, or the rational eye; a supernatural,
prophetic, or imaginary sight; an apparition; a phantom; a
specter; as, the visions of Isaiah.
The baseless fabric of this vision. --Shak.
No dreams, but visions strange. --Sir P.
Sidney.
5. Hence, something unreal or imaginary; a creation of fancy.
--Locke.
Arc of vision (Astron.), the arc which measures the least
distance from the sun at which, when the sun is below the
horizon, a star or planet emerging from his rays becomes
visible.
Beatific vision (Theol.), the immediate sight of God in
heaven.
Direct vision (Opt.), vision when the image of the object
falls directly on the yellow spot (see under Yellow);
also, vision by means of rays which are not deviated from
their original direction.
Field of vision, field of view. See under Field.
Indirect vision (Opt.), vision when the rays of light from
an object fall upon the peripheral parts of the retina.
Reflected vision, or Refracted vision, vision by rays
reflected from mirrors, or refracted by lenses or prisms,
respectively.
Vision purple. (Physiol.) See Visual purple, under
Visual. RefractingRefracting Re*fract"ing, a.
Serving or tending to refract; as, a refracting medium.
Refracting angle of a prism (Opt.), the angle of a
triangular prism included between the two sides through
which the refracted beam passes in the decomposition of
light.
Refracting telescope. (Opt.) See under Telescope. Refracting angle of a prismRefracting Re*fract"ing, a.
Serving or tending to refract; as, a refracting medium.
Refracting angle of a prism (Opt.), the angle of a
triangular prism included between the two sides through
which the refracted beam passes in the decomposition of
light.
Refracting telescope. (Opt.) See under Telescope. Refracting telescopeRefracting Re*fract"ing, a.
Serving or tending to refract; as, a refracting medium.
Refracting angle of a prism (Opt.), the angle of a
triangular prism included between the two sides through
which the refracted beam passes in the decomposition of
light.
Refracting telescope. (Opt.) See under Telescope. Refractive index 3. A table for facilitating reference to topics, names, and
the like, in a book; -- usually alphabetical in
arrangement, and printed at the end of the volume.
4. A prologue indicating what follows. [Obs.] --Shak.
5. (Anat.) The second digit, that next pollex, in the manus,
or hand; the forefinger; index finger.
6. (Math.) The figure or letter which shows the power or root
of a quantity; the exponent. [In this sense the plural is
always indices.]
Index error, the error in the reading of a mathematical
instrument arising from the zero of the index not being in
complete adjustment with that of the limb, or with its
theoretically perfect position in the instrument; a
correction to be applied to the instrument readings equal
to the error of the zero adjustment.
Index expurgatorius. [L.] See Index prohibitorius
(below).
Index finger. See Index, 5.
Index glass, the mirror on the index of a quadrant,
sextant, etc.
Index hand, the pointer or hand of a clock, watch, or other
registering machine; a hand that points to something.
Index of a logarithm (Math.), the integral part of the
logarithm, and always one less than the number of integral
figures in the given number. It is also called the
characteristic.
Index of refraction, or Refractive index (Opt.), the
number which expresses the ratio of the sine of the angle
of incidence to the sine of the angle of refraction. Thus
the index of refraction for sulphur is 2, because, when
light passes out of air into sulphur, the sine of the
angle of incidence is double the sine of the angle of
refraction.
Index plate, a graduated circular plate, or one with
circular rows of holes differently spaced; used in
machines for graduating circles, cutting gear teeth, etc.
Index prohibitorius [L.], or Prohibitory index (R. C.
Ch.), a catalogue of books which are forbidden by the
church to be read; the index expurgatorius [L.], or
expurgatory index, is a catalogue of books from which
passages marked as against faith or morals must be removed
before Catholics can read them. These catalogues are
published with additions, from time to time, by the
Congregation of the Index, composed of cardinals,
theologians, etc., under the sanction of the pope. --Hook.
Index rerum [L.], a tabulated and alphabetized notebook,
for systematic preservation of items, quotations, etc. Refractiveness
Refractiveness Re*fract"ive*ness, n.
The quality or condition of being refractive.
refractometerInterferometer In`ter*fe*rom"e*ter, n. [See Interfere and
-meter.] (Physics)
An instrument for measuring small movements, distances, or
displacements by means of the interference of two beams of
light; -- called also refractometer. Refractometer
Refractometer Re`frac*tom"e*ter (r?`fr?k*t?m"?*t?r), n.
[Refraction + -meter.] (Opt.)
A contrivance for exhibiting and measuring the refraction of
light.
Refractor
Refractor Re*fract"or (r?-fr?kt"?r), n.
Anything that refracts; specifically: (Opt.) A refracting
telescope, in which the image to be viewed is formed by the
refraction of light in passing through a convex lens.
Refractorily
Refractorily Re*frac"to*ri*ly (r?*fr?k"t?*r?*l?), adv.
In a refractory manner; perversely; obstinately.
Refractoriness
Refractoriness Re*frac"to*ri*ness, n.
The quality or condition of being refractory.
Refractory
Refractory Re*frac"to*ry, n.
1. A refractory person. --Bp. Hall.
2. Refractoriness. [Obs.] --Jer. TAylor.
3. OPottery) A piece of ware covered with a vaporable flux
and placed in a kiln, to communicate a glaze to the other
articles. --Knight.
RefractoryRefractory Re*frac"to*ry (-r?), a. [L. refractorius, fr.
refringere: cf. F. refractaire. See Refract.]
1. Obstinate in disobedience; contumacious; stubborn;
unmanageable; as, a refractory child; a refractory beast.
Raging appetites that are Most disobedient and
refractory. --Shak.
2. Resisting ordinary treatment; difficult of fusion,
reduction, or the like; -- said especially of metals and
the like, which do not readily yield to heat, or to the
hammer; as, a refractory ore.
Syn: Perverse; contumacious; unruly; stubborn; obstinate;
unyielding; ungovernable; unmanageable. Refracture
Refracture Re*frac"ture (r?*fr?k"t?r;135), n. (Surg.)
A second breaking (as of a badly set bone) by the surgeon.
Refracture
Refracture Re*frac"ture, v. t. (Surg.)
To break again, as a bone.
Meaning of Refract from wikipedia
