Page:Dictionary of aviation.djvu/26

 DICTIONARY OF AVIATION

��of a fore^lim or wing, toward the axis or median line of the bedy or part to tuhich the lim is attacht: the epposit of abduction.

adiabat '3edi-3,baet n. an adiabatic line or curve; an adia- batic.

adiabatic ,3edi-3'baetik adj. without transference: said of change of velume of a mass of air, or other fluid, unac- companied by any transference of heat to or frem surround- ing masses of air, er, that is, by either gain or less in the total heateenergy containd within the mass.

adiabatic change, a change or variation, as in the tempe- rature of an air^mass, under adiabatic conditions; an alter- ation which is unaccompanied by any transfer of (internal) heateenergy to other (external) masses or localities.

adiabatic curve, a curvd line showing the relation be- ttueen the pressure and the velume of a fluid under adia- batic conditions; a curv which exhibits the relation of the velume of a fluid to the external pressure upon it, when there is no transference of heateenergy either to or frem the fluid.

adiabatic gradient, see under gradient, adiabatic law, the law or principle relating to adiabatic change, as of the velume or temperature of a mass of air or other fluid; the rule as to the expansion or contraction, or the variation in temperature, of an airzmass when sub- jected to different external pressures, but without any less or gain in the total thermal energy possest by the mass.

adiabatic ,sedi-9'b3etik n. a line or other grafic representa- tion (en a wether^map) of adiabatic changes; an adiabatic line or curv ; an adiabat : as, the *adiabatic of dry air.

adjusting-plane a'dsAstir^pz-een n. a small plane or aero- feil, as at the extremity of a wingstip, used to adjust the lateral balance of a f lying^machine ; an adjusting*surface.

adjusting-surface s'dsAStir^sezfis n. an adjustingsplane.

aerial ,e'i:-zi-9i adj. [also spelt aerial and, formerly, aereal]

1. of air as a substance; consisting or composed of air; of the nature of air; aenferm, air^like, gaseous; thin or at- tenuated as air; etherial, shadowy; light as air; airy.

2. of the whole bedy of air, or atmosfere; pertaining to or produced in or by the air or atmosfere; atmosfenc; existing, moving, flying, floating, or functioning in the atmosfere; placed aleft; lefty, elevated.

aerial architecture, airship architecture.

aerial battleship, a battleship of the air; an aerial war- ship; a flying^machine conceivd as being used in aerial warfare.

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