{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.
2. To take off in thin layers or scales, as tartar from the
teeth; to pare off, as a surface. ``If all the mountains
were scaled, and the earth made even.'' --T. Burnet.
3. To scatter; to spread. [Scot. & Prov. Eng.]
4. (Gun.) To clean, as the inside of a cannon, by the
explosion of a small quantity of powder. --Totten.
Long time in even scale The battle hung. --Milton.
The scales are turned; her kindness weighs no more
Now than my vows. --Waller.
2. pl. (Astron.) The sign or constellation Libra.
{Platform scale}. See under {Platform}.
Those that cast their shell are the lobster and
crab; the old skins are found, but the old shells
never; so it is likely that they scale off. --Bacon.
2. To separate; to scatter. [Scot. & Prov. Eng.]
2. Hence, anything graduated, especially when employed as a
measure or rule, or marked by lines at regular intervals.
Specifically:
(a) A mathematical instrument, consisting of a slip of
wood, ivory, or metal, with one or more sets of spaces
graduated and numbered on its surface, for measuring
or laying off distances, etc., as in drawing,
plotting, and the like. See {Gunter's scale}.
(b) A series of spaces marked by lines, and representing
proportionately larger distances; as, a scale of
miles, yards, feet, etc., for a map or plan.
(c) A basis for a numeral system; as, the decimal scale;
the binary scale, etc.
(d) (Mus.) The graduated series of all the tones,
ascending or descending, from the keynote to its
octave; -- called also the {gamut}. It may be repeated
through any number of octaves. See {Chromatic scale},
{Diatonic scale}, {Major scale}, and {Minor scale},
under {Chromatic}, {Diatonic}, {Major}, and {Minor}.
3. Gradation; succession of ascending and descending steps
and degrees; progressive series; scheme of comparative
rank or order; as, a scale of being.
There is a certain scale of duties . . . which for
want of studying in right order, all the world is in
confusion. --Milton.
4. Relative dimensions, without difference in proportion of
parts; size or degree of the parts or components in any
complex thing, compared with other like things;
especially, the relative proportion of the linear
dimensions of the parts of a drawing, map, model, etc., to
the dimensions of the corresponding parts of the object
that is represented; as, a map on a scale of an inch to a
mile.
{Scale of chords}, a graduated scale on which are given the
lengths of the chords of arcs from 0[deg] to 90[deg] in a
circle of given radius, -- used in measuring given angles
and in plotting angles of given numbers of degrees.
Scaling his present bearing with his past. --Shak.
{To} {scale, or scale down}, {a debt, wages, etc.}, to reduce
a debt, etc., according to a fixed ratio or scale. [U.S.]
Fish that, with their fins and shining scales, Glide
under the green wave. --Milton.
2. Hence, any layer or leaf of metal or other material,
resembling in size and thinness the scale of a fish; as, a
scale of iron, of bone, etc.
3. (Zo["o]l.) One of the small scalelike structures covering
parts of some invertebrates, as those on the wings of
Lepidoptera and on the body of Thysanura; the elytra of
certain annelids. See {Lepidoptera}.
4. (Zo["o]l.) A scale insect. (See below.)
5. (Bot.) A small appendage like a rudimentary leaf,
resembling the scales of a fish in form, and often in
arrangement; as, the scale of a bud, of a pine cone, and
the like. The name is also given to the chaff on the stems
of ferns.
6. The thin metallic side plate of the handle of a
pocketknife. See Illust. of {Pocketknife}.
7. An incrustation deposit on the inside of a vessel in which
water is heated, as a steam boiler.
8. (Metal.) The thin oxide which forms on the surface of iron
forgings. It consists essentially of the magnetic oxide,
{Fe3O4}. Also, a similar coating upon other metals.
{Covering scale} (Zo["o]l.), a hydrophyllium.
{Ganoid scale}. (Zo["o]l.) See under {Ganoid}.
{Scale armor} (Mil.), armor made of small metallic scales
overlapping, and fastened upon leather or cloth.
{Scale beetle} (Zo["o]l.), the tiger beetle.
{Scale carp} (Zo["o]l.), a carp having normal scales.
{Scale insect} (Zo["o]l.), any one of numerous species of
small hemipterous insects belonging to the family
{Coccid[ae]}, in which the females, when adult, become
more or less scalelike in form. They are found upon the
leaves and twigs of various trees and shrubs, and often do
great damage to fruit trees. See {Orange scale},under
{Orange}.
{Scale moss} (Bot.), any leafy-stemmed moss of the order
{Hepatic[ae]}; -- so called from the small imbricated
scalelike leaves of most of the species. See {Hepatica},
2, and {Jungermannia}.
Oft have I scaled the craggy oak. --Spenser.
Satan from hence, now on the lower stair, That scaled
by steps of gold to heaven-gate, Looks down with
wonder. --Milton.
{Sexagenary arithmetic}. See under {Sexagesimal}.
{Sexagenary}, or {Sexagesimal}, {scale} (Math.), a scale of
numbers in which the modulus is sixty. It is used in
treating the divisions of the circle.
Not diminish, but rather increase, the debt.
--Barrow.
2. To lessen the authority or dignity of; to put down; to
degrade; to abase; to weaken.
This doth nothing diminish their opinion. --Robynson
(More's
Utopia).
I will diminish them, that they shall no more rule
over the nations. --Ezek. xxix.
15.
O thou . . . at whose sight all the stars Hide their
diminished heads. --Milton.
3. (Mus.) To make smaller by a half step; to make (an
interval) less than minor; as, a diminished seventh.
Neither shall ye diminish aught from it. --Deut. iv.
2.
{Diminished column}, one whose upper diameter is less than
the lower.
{Diminished}, or {Diminishing}, {scale}, a scale of gradation
used in finding the different points for drawing the
spiral curve of the volute. --Gwilt.
{Diminishing rule} (Arch.), a board cut with a concave edge,
for fixing the entasis and curvature of a shaft.
{Diminishing stile} (Arch.), a stile which is narrower in one
part than in another, as in many glazed doors.
Syn: To decrease; lessen; abate; reduce; contract; curtail;
impair; degrade. See {Decrease}.