Page:Dictionary of aviation.djvu/196

 172 DICTIONARY OF AVIATION

3. [also spelt 'plane] a flying-machine whose sustaining*

structures are planes or aeroplanes; an aeroplane flyer; an

aeroplane. plane pi,een adj. such that every straight line joining any

two points in it lies wholly in it; flat; level. plane pteen intr. drive an aeroplane flying-machine ; move

in a flyer : as, he *planed gently downward to earth. plane-dropper 'pi,een,drop3 n. a device invented by S. P.

Langley of Washington, D. C, for studying the aeroplane

when allowd to drop or fall under the influence of gravity

against the aerodynamic resistance cncounterd in its, flight. plane-spar 'pteei^spazz. one of the spars, sticks, or

poles forming the framework of an aeroplane supporting?

surface; the front or rear longitudinal beam of a main

plane of an aeroplane flyer.

planetary 'ptseni,tezi adj. of the planet or earth planetary circulation, see under circulation, planetary wind, see under wind. plan-form 'ptsei^f :zm n. a form of plan ; the plan or shape

(of a wing or other aerofoil) as projected on a horizontal

or vertical plane. planophore 'ptsena/foz n. [also spelt planofore'] a flying-

model produced by A. Penaud in 1871. plan- view 'pz.aen,viou n. the view or aspect of the plan of

an aerofoil. pluma 'p^cm-ma n. [plural pluinac, plnmas} a contour-f ether

of a bird; a penna. plumage 'ptuu-mids n. the f ethers of a bird, collectivly; the

natural covering of a bird; the ptilosis. plunge pz.And5 intr. throw or hurl itself downward thru the

air; dive hedforemost; fall or sink hedfirst in a rapid or

erratic manner : as, to soar and *plunge. pluviograph 'p;Luu-vi,gza:f n. [also spelt pluviograf] an in-

stument for recording rainfall. pneumatics njo'msetiks n. the science of .air and other

gases. pneumotide 'njum^taid n. (fanciful} the tide or swelling

current of the air; the flood of the airy ocean. pocky 'poki adj. having pocks or pock-marks, as mammato-

cumulus cloud. pogonip 'poga-nip n. a frozen fog which forms in cold air

of the high mountain-valleys of Colorado, Idaho, and Ne- vada, and which, if inhaled, is apt to cause pulmonary

trouble. pogonium p3'goo-m~9m n. the vane or web of a bird's fethcr

on either side of the shaft; the vexillum.

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