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sing compressed air from the wind chest to move them. -- Pneumatic dispatch, a system of tubes, leading to various points, through which letters, packages, etc., are sent, by the flow and pressure of air. -- Pneumatic elevator, a hoisting machine worked by compressed air. -- Pneumatic pile, a tubular pile or cylinde…

thern called the arctic circle, and the southern the antarctic circle. -- Polar clock, a tube, containing a polarizing apparatus, turning on an axis parallel to that of the earth, and indicating the hour of the day on an hour circle, by being turned toward the plane of maximum polarization of the light of the sky, whi…

ment of an anther containing pollen, -- usually there are four in each anther. -- Pollen tube, a slender tube which issues from the pollen grain on its contact with the stigma, which it penetrates, thus conveying, it is supposed, the fecundating matter of the grain to the ovule.

e Silkworm family (Bombycidæ). Its larva, which is very large, bright green, with silvery tubercles, and with oblique white stripes on the sides, feeds on the oak, chestnut, willow, cherry, apple, and other trees. It produces a large amount of strong silk. Called also American silkworm.

Having the ends terminating in rounded protuberances or single balls; -- said of a cross.

The knob or protuberant part of a saddlebow.

Having two balls or protuberances at each end; -- said of a cross.

A child's gun; a tube and rammer for shooting pellets, with a popping noise, by compression of air.

.), a range finder. See under Range. -- Position micrometer, a micrometer applied to the tube of an astronomical telescope for measuring angles of position in the field of view. -- Single position (Arith.), the method of solving problems, in which the result obtained by operating with an assumed number is to the true…

Having a protuberant belly, like the bottom of a pot.

A protuberant belly.

A plant (Solanum tuberosum) of the Nightshade family, and its esculent farinaceous tuber, of which there are numerous varieties used for food. It is native of South America, but a form of the species is found native as far north as New Mexico.

A protuberant belly; a paunch; -- so called in ridicule.

-- Powder-down patch (Zoöl.), a tuft or 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…

A flask in which gunpowder is carried, having a charging tube at the end.

e rate of 50.2" annually, caused by the action of the sun, moon, and planets, upon the protuberant matter about the earth's equator, in connection with its diurnal rotation; -- so called because either equinox, owing to its westerly motion, comes to the meridian sooner each day than the point it would have occupied wit…

o, or that which, primes; specifically, an instrument or device for priming; esp., a cap, tube, or water containing percussion powder or other capable for igniting a charge of gunpowder.

as into the cylinder. Priming of the tide. See Lag of the tide, under 2d Lag. -- Priming tube, a small pipe, filled with a combustible composition for firing cannon. -- Priming valve (Steam Eng.), a spring safety valve applied to the cylinder of a steam engine for discharging water carried into the cylinder by primin…

A hollow organ or tube attached to the head, or connected with the mouth, of various animals, and generally used in taking food or drink; a snout; a trunk.

That which is prominent; a protuberance. Solar prominences. (Astron.) See Solar Protuberances, under Protuberance.