| slovo | definícia |
barometer
(encz) | barometer,barometr Pavel Machek; Giza |
barometer
(encz) | barometer,tlakoměr n: Zdeněk Brož |
Barometer
(gcide) | Barometer \Ba*rom"e*ter\, n. [Gr. ba`ros weight + -meter: cf. F.
barom[`e]tre.]
An instrument for determining the weight or pressure of the
atmosphere, and hence for judging of the probable changes of
weather, or for ascertaining the height of any ascent.
[1913 Webster]
Note: The barometer was invented by Torricelli at Florence
about 1643. It is made in its simplest form by filling
a graduated glass tube about 34 inches long with
mercury and inverting it in a cup containing mercury.
The column of mercury in the tube descends until
balanced by the weight of the atmosphere, and its rise
or fall under varying conditions is a measure of the
change in the atmospheric pressure. At the sea level
its ordinary height is about 30 inches (760
millimeters). See Sympiesometer. --Nichol.
[1913 Webster]
Aneroid barometer. See Aneroid barometer, under
Aneroid.
Marine barometer, a barometer with tube contracted at
bottom to prevent rapid oscillations of the mercury, and
suspended in gimbals from an arm or support on shipboard.
Mountain barometer, a portable mercurial barometer with
tripod support, and long scale, for measuring heights.
Siphon barometer, a barometer having a tube bent like a
hook with the longer leg closed at the top. The height of
the mercury in the longer leg shows the pressure of the
atmosphere.
Wheel barometer, a barometer with recurved tube, and a
float, from which a cord passes over a pulley and moves an
index.
[1913 Webster] Barometric |
barometer
(wn) | barometer
n 1: an instrument that measures atmospheric pressure |
barometer
(devil) | BAROMETER, n. An ingenious instrument which indicates what kind of
weather we are having.
|
| | podobné slovo | definícia |
aneroid barometer
(encz) | aneroid barometer,aneroid n: Zdeněk Brož |
mercury barometer
(encz) | mercury barometer, n: |
Aneroid barometer
(gcide) | Aneroid \An"e*roid\, a. [Gr. 'a priv. + nhro`s wet, moist +
-oid: cf. F. an['e]ro["i]de.]
Containing no liquid; -- said of a kind of barometer.
[1913 Webster]
Aneroid barometer, a barometer the action of which depends
on the varying pressure of the atmosphere upon the elastic
top of a metallic box (shaped like a watch) from which the
air has been exhausted. An index shows the variation of
pressure.
[1913 Webster]Barometer \Ba*rom"e*ter\, n. [Gr. ba`ros weight + -meter: cf. F.
barom[`e]tre.]
An instrument for determining the weight or pressure of the
atmosphere, and hence for judging of the probable changes of
weather, or for ascertaining the height of any ascent.
[1913 Webster]
Note: The barometer was invented by Torricelli at Florence
about 1643. It is made in its simplest form by filling
a graduated glass tube about 34 inches long with
mercury and inverting it in a cup containing mercury.
The column of mercury in the tube descends until
balanced by the weight of the atmosphere, and its rise
or fall under varying conditions is a measure of the
change in the atmospheric pressure. At the sea level
its ordinary height is about 30 inches (760
millimeters). See Sympiesometer. --Nichol.
[1913 Webster]
Aneroid barometer. See Aneroid barometer, under
Aneroid.
Marine barometer, a barometer with tube contracted at
bottom to prevent rapid oscillations of the mercury, and
suspended in gimbals from an arm or support on shipboard.
Mountain barometer, a portable mercurial barometer with
tripod support, and long scale, for measuring heights.
Siphon barometer, a barometer having a tube bent like a
hook with the longer leg closed at the top. The height of
the mercury in the longer leg shows the pressure of the
atmosphere.
Wheel barometer, a barometer with recurved tube, and a
float, from which a cord passes over a pulley and moves an
index.
[1913 Webster] Barometric |
Barometer
(gcide) | Barometer \Ba*rom"e*ter\, n. [Gr. ba`ros weight + -meter: cf. F.
barom[`e]tre.]
An instrument for determining the weight or pressure of the
atmosphere, and hence for judging of the probable changes of
weather, or for ascertaining the height of any ascent.
[1913 Webster]
Note: The barometer was invented by Torricelli at Florence
about 1643. It is made in its simplest form by filling
a graduated glass tube about 34 inches long with
mercury and inverting it in a cup containing mercury.
The column of mercury in the tube descends until
balanced by the weight of the atmosphere, and its rise
or fall under varying conditions is a measure of the
change in the atmospheric pressure. At the sea level
its ordinary height is about 30 inches (760
millimeters). See Sympiesometer. --Nichol.
[1913 Webster]
Aneroid barometer. See Aneroid barometer, under
Aneroid.
Marine barometer, a barometer with tube contracted at
bottom to prevent rapid oscillations of the mercury, and
suspended in gimbals from an arm or support on shipboard.
Mountain barometer, a portable mercurial barometer with
tripod support, and long scale, for measuring heights.
Siphon barometer, a barometer having a tube bent like a
hook with the longer leg closed at the top. The height of
the mercury in the longer leg shows the pressure of the
atmosphere.
Wheel barometer, a barometer with recurved tube, and a
float, from which a cord passes over a pulley and moves an
index.
[1913 Webster] Barometric |
Hydrobarometer
(gcide) | Hydrobarometer \Hy`dro*ba*rom"e*ter\, n. [Hydro-, 1 +
barometer.]
An instrument for determining the depth of the sea water by
its pressure.
[1913 Webster] |
Marine barometer
(gcide) | Marine \Ma*rine"\, a. [L. marinus, fr. mare the sea: cf. F.
marin. See Mere a pool.]
1. Of or pertaining to the sea; having to do with the ocean,
or with navigation or naval affairs; nautical; as, marine
productions or bodies; marine shells; a marine engine.
[1913 Webster]
2. (Geol.) Formed by the action of the currents or waves of
the sea; as, marine deposits.
[1913 Webster]
Marine acid (Chem.), hydrochloric acid. [Obs.]
Marine barometer. See under Barometer.
Marine corps, a corps formed of the officers,
noncommissioned officers, privates, and musicants of
marines.
Marine engine (Mech.), a steam engine for propelling a
vessel.
Marine glue. See under Glue.
Marine insurance, insurance against the perils of the sea,
including also risks of fire, piracy, and barratry.
Marine interest, interest at any rate agreed on for money
lent upon respondentia and bottomry bonds.
Marine law. See under Law.
Marine league, three geographical miles.
Marine metal, an alloy of lead, antimony, and mercury, made
for sheathing ships. --Mc Elrath.
Marine soap, cocoanut oil soap; -- so called because, being
quite soluble in salt water, it is much used on shipboard.
Marine store, a store where old canvas, ropes, etc., are
bought and sold; a junk shop. [Eng.]
[1913 Webster]Barometer \Ba*rom"e*ter\, n. [Gr. ba`ros weight + -meter: cf. F.
barom[`e]tre.]
An instrument for determining the weight or pressure of the
atmosphere, and hence for judging of the probable changes of
weather, or for ascertaining the height of any ascent.
[1913 Webster]
Note: The barometer was invented by Torricelli at Florence
about 1643. It is made in its simplest form by filling
a graduated glass tube about 34 inches long with
mercury and inverting it in a cup containing mercury.
The column of mercury in the tube descends until
balanced by the weight of the atmosphere, and its rise
or fall under varying conditions is a measure of the
change in the atmospheric pressure. At the sea level
its ordinary height is about 30 inches (760
millimeters). See Sympiesometer. --Nichol.
[1913 Webster]
Aneroid barometer. See Aneroid barometer, under
Aneroid.
Marine barometer, a barometer with tube contracted at
bottom to prevent rapid oscillations of the mercury, and
suspended in gimbals from an arm or support on shipboard.
Mountain barometer, a portable mercurial barometer with
tripod support, and long scale, for measuring heights.
Siphon barometer, a barometer having a tube bent like a
hook with the longer leg closed at the top. The height of
the mercury in the longer leg shows the pressure of the
atmosphere.
Wheel barometer, a barometer with recurved tube, and a
float, from which a cord passes over a pulley and moves an
index.
[1913 Webster] Barometric |
Mountain barometer
(gcide) | Mountain \Moun"tain\ (moun"t[i^]n), a.
1. Of or pertaining to a mountain or mountains; growing or
living on a mountain; found on or peculiar to mountains;
among mountains; as, a mountain torrent; mountain pines;
mountain goats; mountain air; mountain howitzer.
[1913 Webster]
2. Like a mountain; mountainous; vast; very great.
[1913 Webster]
The high, the mountain majesty of worth. --Byron.
[1913 Webster]
Mountain antelope (Zool.), the goral.
Mountain ash (Bot.), an ornamental tree, the {Pyrus
Americana} (or Sorbus Americana), producing beautiful
bunches of red berries. Its leaves are pinnate, and its
flowers white, growing in fragrant clusters. The European
species is the Pyrus aucuparia, or rowan tree.
Mountain barometer, a portable barometer, adapted for safe
transportation, used in measuring the heights of
mountains.
Mountain beaver (Zool.), the sewellel.
Mountain blue (Min.), blue carbonate of copper; azurite.
Mountain cat (Zool.), the catamount. See Catamount.
Mountain chain, a series of contiguous mountain ranges,
generally in parallel or consecutive lines or curves.
Mountain cock (Zool.), capercailzie. See Capercailzie.
Mountain cork (Min.), a variety of asbestus, resembling
cork in its texture.
Mountain crystal. See under Crystal.
Mountain damson (Bot.), a large tree of the genus
Simaruba (Simaruba amarga) growing in the West Indies,
which affords a bitter tonic and astringent, sometimes
used in medicine.
Mountain dew, Scotch whisky, so called because often
illicitly distilled among the mountains. [Humorous]
Mountain ebony (Bot.), a small leguminous tree ({Bauhinia
variegata}) of the East and West Indies; -- so called
because of its dark wood. The bark is used medicinally and
in tanning.
Mountain flax (Min.), a variety of asbestus, having very
fine fibers; amianthus. See Amianthus.
Mountain fringe (Bot.), climbing fumitory. See under
Fumitory.
Mountain goat. (Zool.) See Mazama.
Mountain green. (Min.)
(a) Green malachite, or carbonate of copper.
(b) See Green earth, under Green, a.
Mountain holly (Bot.), a branching shrub ({Nemopanthes
Canadensis}), having smooth oblong leaves and red berries.
It is found in the Northern United States.
Mountain laurel (Bot.), an American shrub ({Kalmia
latifolia}) with glossy evergreen leaves and showy
clusters of rose-colored or white flowers. The foliage is
poisonous. Called also American laurel, ivy bush, and
calico bush. See Kalmia.
Mountain leather (Min.), a variety of asbestus, resembling
leather in its texture.
Mountain licorice (Bot.), a plant of the genus Trifolium
(Trifolium Alpinum).
Mountain limestone (Geol.), a series of marine limestone
strata below the coal measures, and above the old red
standstone of Great Britain. See Chart of Geology.
Mountain linnet (Zool.), the twite.
Mountain magpie. (Zool.)
(a) The yaffle, or green woodpecker.
(b) The European gray shrike.
Mountain mahogany (Bot.) See under Mahogany.
Mountain meal (Min.), a light powdery variety of calcite,
occurring as an efflorescence.
Mountain milk (Min.), a soft spongy variety of carbonate of
lime.
Mountain mint. (Bot.) See Mint.
Mountain ousel (Zool.), the ring ousel; -- called also
mountain thrush and mountain colley. See Ousel.
Mountain pride, or Mountain green (Bot.), a tree of
Jamaica (Spathelia simplex), which has an unbranched
palmlike stem, and a terminal cluster of large, pinnate
leaves.
Mountain quail (Zool.), the plumed partridge ({Oreortyx
pictus}) of California. It has two long, slender,
plumelike feathers on the head. The throat and sides are
chestnut; the belly is brown with transverse bars of black
and white; the neck and breast are dark gray.
Mountain range, a series of mountains closely related in
position and direction.
Mountain rice. (Bot.)
(a) An upland variety of rice, grown without irrigation,
in some parts of Asia, Europe, and the United States.
(b) An American genus of grasses (Oryzopsis).
Mountain rose (Bot.), a species of rose with solitary
flowers, growing in the mountains of Europe ({Rosa
alpina}).
Mountain soap (Min.), a soft earthy mineral, of a brownish
color, used in crayon painting; saxonite.
Mountain sorrel (Bot.), a low perennial plant ({Oxyria
digyna} with rounded kidney-form leaves, and small
greenish flowers, found in the White Mountains of New
Hampshire, and in high northern latitudes. --Gray.
Mountain sparrow (Zool.), the European tree sparrow.
Mountain spinach. (Bot.) See Orach.
Mountain tobacco (Bot.), a composite plant ({Arnica
montana}) of Europe; called also leopard's bane.
Mountain witch (Zool.), a ground pigeon of Jamaica, of the
genus Geotrygon.
[1913 Webster]Barometer \Ba*rom"e*ter\, n. [Gr. ba`ros weight + -meter: cf. F.
barom[`e]tre.]
An instrument for determining the weight or pressure of the
atmosphere, and hence for judging of the probable changes of
weather, or for ascertaining the height of any ascent.
[1913 Webster]
Note: The barometer was invented by Torricelli at Florence
about 1643. It is made in its simplest form by filling
a graduated glass tube about 34 inches long with
mercury and inverting it in a cup containing mercury.
The column of mercury in the tube descends until
balanced by the weight of the atmosphere, and its rise
or fall under varying conditions is a measure of the
change in the atmospheric pressure. At the sea level
its ordinary height is about 30 inches (760
millimeters). See Sympiesometer. --Nichol.
[1913 Webster]
Aneroid barometer. See Aneroid barometer, under
Aneroid.
Marine barometer, a barometer with tube contracted at
bottom to prevent rapid oscillations of the mercury, and
suspended in gimbals from an arm or support on shipboard.
Mountain barometer, a portable mercurial barometer with
tripod support, and long scale, for measuring heights.
Siphon barometer, a barometer having a tube bent like a
hook with the longer leg closed at the top. The height of
the mercury in the longer leg shows the pressure of the
atmosphere.
Wheel barometer, a barometer with recurved tube, and a
float, from which a cord passes over a pulley and moves an
index.
[1913 Webster] Barometric |
Siphon barometer
(gcide) | Siphon \Si"phon\, n. [F. siphon, L. sipho, -onis, fr. Gr. ??? a
siphon, tube, pipe.]
1. A device, consisting of a pipe or tube bent so as to form
two branches or legs of unequal length, by which a liquid
can be transferred to a lower level, as from one vessel to
another, over an intermediate elevation, by the action of
the pressure of the atmosphere in forcing the liquid up
the shorter branch of the pipe immersed in it, while the
continued excess of weight of the liquid in the longer
branch (when once filled) causes a continuous flow. The
flow takes place only when the discharging extremity of
the pipe ia lower than the higher liquid surface, and when
no part of the pipe is higher above the surface than the
same liquid will rise by atmospheric pressure; that is,
about 33 feet for water, and 30 inches for mercury, near
the sea level.
[1913 Webster]
2. (Zool.)
(a) One of the tubes or folds of the mantle border of a
bivalve or gastropod mollusk by which water is
conducted into the gill cavity. See Illust. under
Mya, and Lamellibranchiata.
(b) The anterior prolongation of the margin of any
gastropod shell for the protection of the soft siphon.
(c) The tubular organ through which water is ejected from
the gill cavity of a cephaloid. It serves as a
locomotive organ, by guiding and confining the jet of
water. Called also siphuncle. See Illust. under
Loligo, and Dibranchiata.
(d) The siphuncle of a cephalopod shell.
(e) The sucking proboscis of certain parasitic insects and
crustaceans.
(f) A sproutlike prolongation in front of the mouth of
many gephyreans.
(g) A tubular organ connected both with the esophagus and
the intestine of certain sea urchins and annelids.
[1913 Webster]
3. A siphon bottle.
[1913 Webster]
Inverted siphon, a tube bent like a siphon, but having the
branches turned upward; specifically (Hydraulic
Engineering), a pipe for conducting water beneath a
depressed place, as from one hill to another across an
intervening valley, following the depression of the
ground.
Siphon barometer. See under Barometer.
Siphon bottle, a bottle for holding aerated water, which is
driven out through a bent tube in the neck by the gas
within the bottle when a valve in the tube is opened; --
called also gazogene, and siphoid.
Siphon condenser, a condenser for a steam engine, in which
the vacuum is maintained by the downward flow of water
through a vertical pipe of great height.
Siphon cup, a cup with a siphon attached for carrying off
any liquid in it; specifically (Mach.), an oil cup in
which oil is carried over the edge of a tube in a cotton
wick, and so reaches the surface to be lubricated.
Siphon gauge. See under Gauge.
Siphon pump, a jet pump. See under Jet, n.
[1913 Webster]Barometer \Ba*rom"e*ter\, n. [Gr. ba`ros weight + -meter: cf. F.
barom[`e]tre.]
An instrument for determining the weight or pressure of the
atmosphere, and hence for judging of the probable changes of
weather, or for ascertaining the height of any ascent.
[1913 Webster]
Note: The barometer was invented by Torricelli at Florence
about 1643. It is made in its simplest form by filling
a graduated glass tube about 34 inches long with
mercury and inverting it in a cup containing mercury.
The column of mercury in the tube descends until
balanced by the weight of the atmosphere, and its rise
or fall under varying conditions is a measure of the
change in the atmospheric pressure. At the sea level
its ordinary height is about 30 inches (760
millimeters). See Sympiesometer. --Nichol.
[1913 Webster]
Aneroid barometer. See Aneroid barometer, under
Aneroid.
Marine barometer, a barometer with tube contracted at
bottom to prevent rapid oscillations of the mercury, and
suspended in gimbals from an arm or support on shipboard.
Mountain barometer, a portable mercurial barometer with
tripod support, and long scale, for measuring heights.
Siphon barometer, a barometer having a tube bent like a
hook with the longer leg closed at the top. The height of
the mercury in the longer leg shows the pressure of the
atmosphere.
Wheel barometer, a barometer with recurved tube, and a
float, from which a cord passes over a pulley and moves an
index.
[1913 Webster] Barometric |
Telehydrobarometer
(gcide) | Telehydrobarometer \Tel`e*hy`dro*ba*rom"e*ter\, n. [Gr. th^le
far + hydrobarometer.]
An instrument for indicating the level of water in a distant
tank or reservior.
[Webster 1913 Suppl.] |
Thermobarometer
(gcide) | Thermobarometer \Ther`mo*ba*rom"e*ter\, n. [Thermo- +
barometer.]
1. (Physics) An instrument for determining altitudes by the
boiling point of water.
[1913 Webster]
2. A siphon barometer adapted to be used also as a
thermometer.
[Webster 1913 Suppl.] |
Water barometer
(gcide) | Water barometer \Wa"ter ba*rom"e*ter\ (Physics)
A barometer in which the changes of atmospheric pressure are
indicated by the motion of a column of water instead of
mercury. It requires a column of water about thirty-three
feet in height.
[1913 Webster] |
Wheel barometer
(gcide) | Wheel \Wheel\ (hw[=e]l), n. [OE. wheel, hweol, AS. hwe['o]l,
hweogul, hweowol; akin to D. wiel, Icel. hv[=e]l, Gr.
ky`klos, Skr. cakra; cf. Icel. hj[=o]l, Dan. hiul, Sw. hjul.
[root]218. Cf. Cycle, Cyclopedia.]
[1913 Webster]
1. A circular frame turning about an axis; a rotating disk,
whether solid, or a frame composed of an outer rim, spokes
or radii, and a central hub or nave, in which is inserted
the axle, -- used for supporting and conveying vehicles,
in machinery, and for various purposes; as, the wheel of a
wagon, of a locomotive, of a mill, of a watch, etc.
[1913 Webster]
The gasping charioteer beneath the wheel
Of his own car. --Dryden.
[1913 Webster]
2. Any instrument having the form of, or chiefly consisting
of, a wheel. Specifically:
[1913 Webster]
(a) A spinning wheel. See under Spinning.
[1913 Webster]
(b) An instrument of torture formerly used.
[1913 Webster]
His examination is like that which is made by
the rack and wheel. --Addison.
[1913 Webster]
Note: This mode of torture is said to have been first
employed in Germany, in the fourteenth century. The
criminal was laid on a cart wheel with his legs and
arms extended, and his limbs in that posture were
fractured with an iron bar. In France, where its use
was restricted to the most atrocious crimes, the
criminal was first laid on a frame of wood in the form
of a St. Andrew's cross, with grooves cut transversely
in it above and below the knees and elbows, and the
executioner struck eight blows with an iron bar, so as
to break the limbs in those places, sometimes finishing
by two or three blows on the chest or stomach, which
usually put an end to the life of the criminal, and
were hence called coups-de-grace -- blows of mercy. The
criminal was then unbound, and laid on a small wheel,
with his face upward, and his arms and legs doubled
under him, there to expire, if he had survived the
previous treatment. --Brande.
[1913 Webster]
(c) (Naut.) A circular frame having handles on the
periphery, and an axle which is so connected with the
tiller as to form a means of controlling the rudder
for the purpose of steering.
[1913 Webster]
(d) (Pottery) A potter's wheel. See under Potter.
[1913 Webster]
Then I went down to the potter's house, and,
behold, he wrought a work on the wheels. --Jer.
xviii. 3.
[1913 Webster]
Turn, turn, my wheel! This earthen jar
A touch can make, a touch can mar. --Longfellow.
[1913 Webster]
(e) (Pyrotechny) A firework which, while burning, is
caused to revolve on an axis by the reaction of the
escaping gases.
[1913 Webster]
(f) (Poetry) The burden or refrain of a song.
[1913 Webster]
Note: "This meaning has a low degree of authority, but is
supposed from the context in the few cases where the
word is found." --Nares.
[1913 Webster]
You must sing a-down a-down,
An you call him a-down-a.
O, how the wheel becomes it! --Shak.
[1913 Webster]
[1913 Webster]
3. A bicycle or a tricycle; a velocipede.
[1913 Webster]
4. A rolling or revolving body; anything of a circular form;
a disk; an orb. --Milton.
[1913 Webster]
5. A turn revolution; rotation; compass.
[1913 Webster]
According to the common vicissitude and wheel of
things, the proud and the insolent, after long
trampling upon others, come at length to be trampled
upon themselves. --South.
[1913 Webster]
[He] throws his steep flight in many an aery wheel.
--Milton.
[1913 Webster]
A wheel within a wheel, or Wheels within wheels, a
complication of circumstances, motives, etc.
Balance wheel. See in the Vocab.
Bevel wheel, Brake wheel, Cam wheel, Fifth wheel,
Overshot wheel, Spinning wheel, etc. See under Bevel,
Brake, etc.
Core wheel. (Mach.)
(a) A mortise gear.
(b) A wheel having a rim perforated to receive wooden
cogs; the skeleton of a mortise gear.
Measuring wheel, an odometer, or perambulator.
Wheel and axle (Mech.), one of the elementary machines or
mechanical powers, consisting of a wheel fixed to an axle,
and used for raising great weights, by applying the power
to the circumference of the wheel, and attaching the
weight, by a rope or chain, to that of the axle. Called
also axis in peritrochio, and perpetual lever, -- the
principle of equilibrium involved being the same as in the
lever, while its action is continuous. See {Mechanical
powers}, under Mechanical.
Wheel animal, or Wheel animalcule (Zool.), any one of
numerous species of rotifers having a ciliated disk at the
anterior end.
Wheel barometer. (Physics) See under Barometer.
Wheel boat, a boat with wheels, to be used either on water
or upon inclined planes or railways.
Wheel bug (Zool.), a large North American hemipterous
insect (Prionidus cristatus) which sucks the blood of
other insects. So named from the curious shape of the
prothorax.
Wheel carriage, a carriage moving on wheels.
Wheel chains, or Wheel ropes (Naut.), the chains or ropes
connecting the wheel and rudder.
Wheel cutter, a machine for shaping the cogs of gear
wheels; a gear cutter.
Wheel horse, one of the horses nearest to the wheels, as
opposed to a leader, or forward horse; -- called also
wheeler.
Wheel lathe, a lathe for turning railway-car wheels.
Wheel lock.
(a) A letter lock. See under Letter.
(b) A kind of gunlock in which sparks were struck from a
flint, or piece of iron pyrites, by a revolving wheel.
(c) A kind of brake a carriage.
Wheel ore (Min.), a variety of bournonite so named from the
shape of its twin crystals. See Bournonite.
Wheel pit (Steam Engine), a pit in the ground, in which the
lower part of the fly wheel runs.
Wheel plow, or Wheel plough, a plow having one or two
wheels attached, to render it more steady, and to regulate
the depth of the furrow.
Wheel press, a press by which railway-car wheels are forced
on, or off, their axles.
Wheel race, the place in which a water wheel is set.
Wheel rope (Naut.), a tiller rope. See under Tiller.
Wheel stitch (Needlework), a stitch resembling a spider's
web, worked into the material, and not over an open space.
--Caulfeild & S. (Dict. of Needlework).
Wheel tree (Bot.), a tree (Aspidosperma excelsum) of
Guiana, which has a trunk so curiously fluted that a
transverse section resembles the hub and spokes of a
coarsely made wheel. See Paddlewood.
Wheel urchin (Zool.), any sea urchin of the genus Rotula
having a round, flat shell.
Wheel window (Arch.), a circular window having radiating
mullions arranged like the spokes of a wheel. Cf. {Rose
window}, under Rose.
[1913 Webster]Barometer \Ba*rom"e*ter\, n. [Gr. ba`ros weight + -meter: cf. F.
barom[`e]tre.]
An instrument for determining the weight or pressure of the
atmosphere, and hence for judging of the probable changes of
weather, or for ascertaining the height of any ascent.
[1913 Webster]
Note: The barometer was invented by Torricelli at Florence
about 1643. It is made in its simplest form by filling
a graduated glass tube about 34 inches long with
mercury and inverting it in a cup containing mercury.
The column of mercury in the tube descends until
balanced by the weight of the atmosphere, and its rise
or fall under varying conditions is a measure of the
change in the atmospheric pressure. At the sea level
its ordinary height is about 30 inches (760
millimeters). See Sympiesometer. --Nichol.
[1913 Webster]
Aneroid barometer. See Aneroid barometer, under
Aneroid.
Marine barometer, a barometer with tube contracted at
bottom to prevent rapid oscillations of the mercury, and
suspended in gimbals from an arm or support on shipboard.
Mountain barometer, a portable mercurial barometer with
tripod support, and long scale, for measuring heights.
Siphon barometer, a barometer having a tube bent like a
hook with the longer leg closed at the top. The height of
the mercury in the longer leg shows the pressure of the
atmosphere.
Wheel barometer, a barometer with recurved tube, and a
float, from which a cord passes over a pulley and moves an
index.
[1913 Webster] Barometric |
aneroid barometer
(wn) | aneroid barometer
n 1: a barometer that measures pressure without using fluids
[syn: aneroid barometer, aneroid] |
mercury barometer
(wn) | mercury barometer
n 1: barometer that shows pressure by the height of a column of
mercury |
|