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Moved or worked by pressure or flow of air; as, a pneumatic instrument; a pneumatic engine.

treats of the mechanical properties of air and other elastic fluids, as of their weight, pressure, elasticity, etc. See Mechanics.

two or more phases; multiphase; as, a polyphase machine, a machine producing two or more pressure waves of electro-motive force, differing in phase; a polyphase current.

A machine generating more than one pressure wave; a multiphaser.

ties which lie in the plane of the inclined braces at a portal, serving to transfer wind pressure from the upper parts of the trusses to an abutment or pier of the bridge.

Capable of holding up or carrying; as, the portative force of a magnet, of atmospheric pressure, or of capillarity.

Applied force; force producing motion or pressure; as, the power applied at one and of a lever to lift a weight at the other end.

ave. The predicrotic or tidal wave is best marked in a hard pulse, i. e., where the blood pressure is high. Landois & Stirling.

To exert pressure; to bear heavily; to push, crowd, or urge with steady force.

The act of pressing; pressure. Sir I. Newton.

Causing, or giving rise to, pressure or to an increase of pressure; as, pressor nerve fibers, stimulation of which excites the vasomotor center, thus causing a stronger contraction of the arteries and consequently an increase of the arterial blood pressure; -- opposed to depressor. Landois & Stirling.…

Pressure.

; heat obtained by chemical combination, and applied to produce changes in the volume and pressure of steam, air, or other fluids; and electricity, obtained by chemical action, and applied to produce alternation of magnetic force. (b) An engine, or machine, the object of which is to receive and modify force and motion…

To stamp something in or upon; to make an impression or mark upon by pressure, or as by pressure. Forth on his fiery steed betimes he rode, That scarcely prints the turf on which he trod. Dryden.

ating motion of the liquid when thus warmed. Pulse wave (Physiol.), the wave of increased pressure started by the ventricular systole, radiating from the semilunar valves over the arterial system, and gradually disappearing in the smaller branches. the pulse wave travels over the arterial system at the rate of about 29…

A device, with valves, for raising water by steam, partly by atmospheric pressure, and partly by the direct action of the steam on the water, without the intervention of a piston; -- also called vacuum pump.

To perforate or stamp with an instrument by pressure, or a blow; as, to punch a hole; to punch ticket. Punching machine, or Punching press, a machine tool for punching holes in metal or other material; -- called also punch press.

To press against with force; to drive or impel by pressure; to endeavor to drive by steady pressure, without striking; -- opposed to draw. Sidelong had pushed a mountain from his seat. Milton.

Sand easily moved or readily yielding to pressure; especially, a deep mass of loose or moving sand mixed with water, sometimes found at the mouth of a river or along some coasts, and very dangerous, from the difficulty of extricating a person who begins sinking into it. Life hath quicksands, -- Life hath snares! Longfe…

red about two quills or bodies of similar shape, in order to produce a suitable degree of pressure.