Definition of Micrameter
Mi*crom"e*ter (?), n. [Micro- +
-meter: cf. F. micromètre.] 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.
- Webster's Unabridged Dictionary (1913)
- A device used to measure distance very precisely but within a limited range, especially depth, thickness, and diameter.
- The Nuttall Encyclopedia
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