| slovo | definícia |
drop hammer
(encz) | drop hammer, n: |
Drop hammer
(gcide) | Hammer \Ham"mer\ (h[a^]m"m[~e]r), n. [OE. hamer, AS. hamer,
hamor; akin to D. hamer, G. & Dan. hammer, Sw. hammare, Icel.
hamarr, hammer, crag, and perh. to Gr. 'a`kmwn anvil, Skr.
a[,c]man stone.]
1. An instrument for driving nails, beating metals, and the
like, consisting of a head, usually of steel or iron,
fixed crosswise to a handle.
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With busy hammers closing rivets up. --Shak.
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2. Something which in form or action resembles the common
hammer; as:
(a) That part of a clock which strikes upon the bell to
indicate the hour.
(b) The padded mallet of a piano, which strikes the wires,
to produce the tones.
(c) (Anat.) The malleus. See under Ear.
(d) (Gun.) That part of a gunlock which strikes the
percussion cap, or firing pin; the cock; formerly,
however, a piece of steel covering the pan of a
flintlock musket and struck by the flint of the cock
to ignite the priming.
(e) Also, a person or thing that smites or shatters; as,
St. Augustine was the hammer of heresies.
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He met the stern legionaries [of Rome] who had
been the "massive iron hammers" of the whole
earth. --J. H.
Newman.
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3. (Athletics) A spherical weight attached to a flexible
handle and hurled from a mark or ring. The weight of head
and handle is usually not less than 16 pounds.
[Webster 1913 Suppl.]
Atmospheric hammer, a dead-stroke hammer in which the
spring is formed by confined air.
Drop hammer, Face hammer, etc. See under Drop, Face,
etc.
Hammer fish. See Hammerhead.
Hammer hardening, the process of hardening metal by
hammering it when cold.
Hammer shell (Zool.), any species of Malleus, a genus of
marine bivalve shells, allied to the pearl oysters, having
the wings narrow and elongated, so as to give them a
hammer-shaped outline; -- called also hammer oyster.
To bring to the hammer, to put up at auction.
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Drop hammer
(gcide) | Drop \Drop\ (dr[o^]p), n. [OE. drope, AS. dropa; akin to OS.
dropo, D. drop, OHG. tropo, G. tropfen, Icel. dropi, Sw.
droppe; and Fr. AS. dre['o]pan to drip, drop; akin to OS.
driopan, D. druipen, OHG. triofan, G. triefen, Icel.
drj[=u]pa. Cf. Drip, Droop.]
1. The quantity of fluid which falls in one small spherical
mass; a liquid globule; a minim; hence, also, the smallest
easily measured portion of a fluid; a small quantity; as,
a drop of water.
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With minute drops from off the eaves. --Milton.
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As dear to me as are the ruddy drops
That visit my sad heart. -- Shak.
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That drop of peace divine. --Keble.
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2. That which resembles, or that which hangs like, a liquid
drop; as a hanging diamond ornament, an earring, a glass
pendant on a chandelier, a sugarplum (sometimes
medicated), or a kind of shot or slug.
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3. (Arch.)
(a) Same as Gutta.
(b) Any small pendent ornament.
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4. Whatever is arranged to drop, hang, or fall from an
elevated position; also, a contrivance for lowering
something; as:
(a) A door or platform opening downward; a trap door; that
part of the gallows on which a culprit stands when he
is to be hanged; hence, the gallows itself.
(b) A machine for lowering heavy weights, as packages,
coal wagons, etc., to a ship's deck.
(c) A contrivance for temporarily lowering a gas jet.
(d) A curtain which drops or falls in front of the stage
of a theater, etc.
(e) A drop press or drop hammer.
(f) (Mach.) The distance of the axis of a shaft below the
base of a hanger.
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5. pl. Any medicine the dose of which is measured by drops;
as, lavender drops.
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6. (Naut.) The depth of a square sail; -- generally applied
to the courses only. --Ham. Nav. Encyc.
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7. Act of dropping; sudden fall or descent.
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Ague drop, Black drop. See under Ague, Black.
Drop by drop, in small successive quantities; in repeated
portions. "Made to taste drop by drop more than the
bitterness of death." --Burke.
Drop curtain. See Drop, n., 4.
(d) .
Drop forging. (Mech.)
(a) A forging made in dies by a drop hammer.
(b) The process of making drop forgings.
Drop hammer (Mech.), a hammer for forging, striking up
metal, etc., the weight being raised by a strap or similar
device, and then released to drop on the metal resting on
an anvil or die.
Drop kick (Football), a kick given to the ball as it
rebounds after having been dropped from the hands.
Drop lake, a pigment obtained from Brazil wood. --Mollett.
Drop letter, a letter to be delivered from the same office
where posted.
Drop press (Mech.), a drop hammer; sometimes, a dead-stroke
hammer; -- also called drop.
Drop scene, a drop curtain on which a scene is painted. See
Drop, n., 4.
(d) .
Drop seed. (Bot.) See the List under Glass.
Drop serene. (Med.) See Amaurosis.
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drop hammer
(wn) | drop hammer
n 1: device for making large forgings [syn: drop forge, {drop
hammer}, drop press] |
| | podobné slovo | definícia |
drop hammer
(encz) | drop hammer, n: |
Friction drop hammer
(gcide) | Friction \Fric"tion\, n. [L. frictio, fr. fricare, frictum,to
rub: cf. F. friction. See Fray to rub, arid cf.
Dentifrice.]
1. The act of rubbing the surface of one body against that of
another; attrition; in hygiene, the act of rubbing the
body with the hand, with flannel, or with a brush etc., to
excite the skin to healthy action.
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2. (Mech.) The resistance which a body meets with from the
surface on which it moves. It may be resistance to sliding
motion, or to rolling motion.
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3. A clashing between two persons or parties in opinions or
work; a disagreement tending to prevent or retard
progress.
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Angle of friction (Mech.), the angle which a plane onwhich
a body is lying makes with a horizontal plane,when the
hody is just ready to slide dewn the plane.
Note: This angle varies for different bodies, and for planes
of different materials.
Anti-friction wheels (Mach.), wheels turning freely on
small pivots, and sustaining, at the angle formed by their
circumferences, the pivot or journal of a revolving shaft,
to relieve it of friction; -- called also {friction
wheels}.
Friction balls, or
Friction rollers, balls or rollers placed so as to receive
the pressure or weight of bodies in motion, and relieve
friction, as in the hub of a bicycle wheel.
Friction brake (Mach.), a form of dynamometer for measuring
the power a motor exerts. A clamp around the revolving
shaft or fly wheel of the motor resists the motion by its
friction, the work thus absorbed being ascertained by
observing the force required to keep the clamp from
revolving with the shaft; a Prony brake.
Friction chocks, brakes attached to the common standing
garrison carriages of guns, so as to raise the trucks or
wheels off the platform when the gun begins to recoil, and
prevent its running back. --Earrow.
Friction clutch, Friction coupling, an engaging and
disengaging gear for revolving shafts, pulleys, etc.,
acting by friction; esp.:
(a) A device in which a piece on one shaft or pulley is so
forcibly pressed against a piece on another shaft that
the two will revolve together; as, in the
illustration, the cone a on one shaft, when thrust
forcibly into the corresponding hollow cone b on the
other shaft, compels the shafts to rotate together, by
the hold the friction of the conical surfaces gives.
(b) A toothed clutch, one member of which, instead of
being made fast on its shaft, is held by friction and
can turn, by slipping, under excessive strain or in
starting.
Friction drop hammer, one in which the hammer is raised for
striking by the friction of revolving rollers which nip
the hammer rod.
Friction gear. See Frictional gearing, under
Frictional.
Friction machine, an electrical machine, generating
electricity by friction.
Friction meter, an instrument for measuring friction, as in
testing lubricants.
Friction powder, Friction composition, a composition of
chlorate of potassium, antimony, sulphide, etc, which
readily ignites by friction.
Friction primer, Friction tube, a tube used for firing
cannon by means of the friction of a roughened wire in the
friction powder or composition with which the tube is
filled.
Friction wheel (Mach.), one of the wheels in frictional
gearing. See under Frictional.
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drop hammer
(wn) | drop hammer
n 1: device for making large forgings [syn: drop forge, {drop
hammer}, drop press] |
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