Page:Dictionary of aviation.djvu/204

 180 DICTIONARY OF AVIATION

but net strictly, aerial; aerial in certain respects: as,

quill kunl n. the tube or barrel of a bird's fether, the part
 * quasi?aerial locomotion.

whose base is attacht to the skin; sometimes, also, the tube

and shaft, taken together; and, further, the whole fether;

a quill^fether.

bastard quills, the quills growing upon the bastard wing,

the winglet, or thum of a bird; the quills of the alula; the

spuriae. quill-covert 'ktui},kAV9t n. one of the fethers immediately

covering the bases of the quilbfethers or quills of 'the

wings of a bird; a wing^covert or a tail^covert; a tectjix. quill-feather 'kiuil,fed9c: n. [also spelt quillif ether] one of

the large flight^fethers or remiges of a bird's wing, er,

sometimes, of the tail, provided with a quill or hellow tube

at the base; a quill.

��racliis 'zee-kis n. [also spelt rhachis'] the stem, shaft, or scape of a bird's fether, as distinguisht from the vexilla. vanes, or webs; in quilM ethers, the upper opaque part of the stem which bears the vexilla or vanes, as distinguisht from the calamus or quill.

racing-aeroplane 'zee-sin,ee-3Z3-pz,een n. same meaning as racingiplane.

racing-machine 'zee-sirj-ni9,$iin n. an aeroplane or other air^machine used for racing; a speed machine; a racer.

racing-plane 'zee-sir^pteen n. an aeroplane flying^machine designed for racing or speed; a racing^machine of the aero- plane type.

radiation ,zedi'ee-$3n n. the act of radiating; the state of being radiated; the amount of heaterays or other ferm of radiant energy shot forth frem a given source.

atmospheric radiation, the thermal radiation from the earth's atmosfere; the radiant dissipation of heat from the atmosfere.

solar radiation, the radiation of the sun as mesured by the heat the earth receivs frem it.

coefficient of radiation, the constant numerical mesure of radiation ; the unit of radiating=power, as of a given portion of the earth's atmosfere, or of a given quality of air.

radiation-fog ,redi'ee-$3n,feg n. feg caused by radiation of heat en low grounds.

radiation-thermometer ^edi'ee-Son-Oo^memi-tDz n. a

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