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machine worked by compressed air. -- Pneumatic pile, a tubular pile or cylinder of large diameter sunk by atmospheric pressure. -- Pneumatic pump, an air-exhausting or forcing pump. -- Pneumatic railway. See Atmospheric railway, under Atmospheric. -- Pneumatic syringe, a stout tube closed at one end, and provided w…

y distant from every part of the circumference of a great circle; or the point in which a diameter of the sphere perpendicular to the plane of such circle meets the surface. Such a point is called the pole of that circle; as, the pole of the horizon; the pole of the ecliptic; the pole of a given meridian.…

patch of powder-down feathers. -- Powder hose, a tube of strong linen, about an inch in diameter, filled with powder and used in firing mines. Farrow. -- Powder hoy (Naut.), a vessel specially fitted to carry powder for the supply of war ships. They are usually painted red and carry a red flag. -- Powder magazine,…

d usually in the microscope, the number of times it multiplies, or augments, the apparent diameter of an object; sometimes, in microscopes, the number of times it multiplies the apparent surface.

The nut of an Australian tree (Macadamia ternifolia). It is about an inch in diameter, and contains a single round edible seed, or sometimes two hemispherical seeds. So called from Queensland in Australia.

A right line drawn or extending from the center of a circle to the periphery; the semidiameter of a circle or sphere.

have a carrionlike odor, and are very large, in one species (Rafflesia Arnoldi) having a diameter of two or three feet.

riangle about one of its sides generates a cone; the revolution of a semicircle about the diameter generates a sphere.

border often faced with rubber, used as a cushion in bank shots. The balls are 3¼ in. in diameter, the cage (center arches or wickets) 3 3/8 in. wide, the other arches 3½ in. wide.

of the tropical myrtaceous tree Eugenia Jambos. It is an edible berry an inch or more in diameter, and is said to have a very strong roselike perfume. -- Rose beetle. (Zoöl.) (a) A small yellowish or buff longlegged beetle (Macrodactylus subspinosus), which eats the leaves of various plants, and is often very injurio…

A small circular shield, sometimes not more than a foot in diameter, used by soldiers in the fourteenth and fifteenth centuries.

A bicycle with equal or nearly equal wheels, usually 28 inches diameter, driven by pedals connected to the rear (driving) wheel by a multiplying gear.

nets of the solar system, next in magnitude to Jupiter, but more remote from the sun. Its diameter is seventy thousand miles, its mean distance from the sun nearly eight hundred and eighty millions of miles, and its year, or periodical revolution round the sun, nearly twenty-nine years and a half. It is surrounded by a…

owing in tropical India and America. They contain hard round flattish seeds two inches in diameter, which are made into boxes.

The half of a circle; the part of a circle bounded by its diameter and half of its circumference.

and ledges round the hatchways of a ship. -- Shot gauge, an instrument for measuring the diameter of round shot. Totten. -- shot hole, a hole made by a shot or bullet discharged. -- Shot locker (Naut.), a strongly framed compartment in the hold of a vessel, for containing shot. -- Shot of a cable (Naut.), the splic…

The length of a perpendicular drawn from one extremity of an arc of a circle to the diameter drawn through the other extremity.

Of small diameter or thickness in proportion to the height or length; slender; as, a slim person; a slim tree. Grose.

To become reduced in diameter, or changed in shape, by passing from a larger to a smaller part of the bore of the barrel; -- said of a bullet when fired from a gun, pistol, or other firearm.

The parallax of the sun, that is, the angle subtended at the sun by the semidiameter of the earth. It is 8."80, and is the fundamental datum.