Page:Dictionary of aviation.djvu/54

 30 DICTIONARY OF AVIATION

ascensionist 9'sen$9-nist n. one who makes balloon^ascen- sions; a balloonist.

ascensive a'sensiv adj. [also spelt ascensiv] ef or pertain- ing to ascension; mounting or rising in the air.

ascent s'sent n. a rising or mounting into the air; an ascension, as of a balloon or flyer; a balloon^ascent.

double ascent, an ascent made by two persons at once in the same machine; a two^man ascent. nocturnal ascent, see nocturnal.

aspect 'se,spekt n.

1. look, appearance, as of the sky or of a wether?map. aspect of a weather-map, the appearance of a (daily)

wether^map, its isobars, isotherms, etc., with reference to changes affecting a given point; the direction of the gradient at any given station.

aspect of the sky, the appearance of the sky, especially with reference to change of wether, etc.; the sky^aspect. aspect.

barometric aspect, the aspect of a daily wether^map with reference to barometric pressure; the direction in which lies the point toward tuhich the principle barometric gradient is rising.

thermal aspect, the aspect of a (daily) wether^map with reference to thermal conditions; the direction in which lies the point toward which the principle thermometic or temperature gradient is moving; the direction frem which a change of temperature appears to be advancing toward a given station.

2. the appearance or look presented by an aerofoil ac- cording as it is viewd in the direction of flight, or at right angles to the plane of flight; the arrangement or di- mensional proportions of an aeroplane, or other aerofoil, .in relation to the direction of flight, or in relation to its posi- tion about its vertical axis, compare attitude.

apteroid aspect, an aspect or appearance unlike that of wings; wingless aspect; specifically, the aspect of an aero- plane or other aerofoil when it presents the appearance (if viewd in the direction of flight) as of something relativly destitute of wings or sustaining^surf aces ; also, the appear- ance of an aerofoil the greater dimension of which is in the direction of flight (which is the reverse of the arrange- ment which obtains in the wing plan^form of birds).

horizontal aspect, the aspect of the horizontal dimen- sional proportions, or plan^ferm, of an aeroplane or other aerofoil; the appearance of an aerofoil as viewd in its horizontal extension or as posed in the plane of its flight.

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