DICTIONARY OF AVIATION 227
tender-wing 'tends^wirj n. a newcomer or beginner in the art of flight; an aerial nevice or amateur; a fledgling.
tense tens adj. being in a state of tension; stjetcht until tight; rigid; net lax; taut, as the envelop of a balloon.
tension-buffer 'ten$3n,bAfaz n. a buffer, as of rubber, as on the axle of a skidnuheel, for providing or regulating ten- sion or strain.
tension-wire 'ten$3n,waiz n. a wire, as in an aeroplane flying^machine, by tuhich a strain of tension is applied; a wire which regulates or provides tensil strain.
terra firma ,tez9'fi3:z-ni3 n.
1. firm or selid earth; dry land, as distinguisht from water; the land.
2. the earth or land, as distinguisht from the air or at- mosfere; the ground.
terrain ,te'zeen n. the ground, or any portion of the land^ surface.
terrestrial ta'zestrj-al adj. ef or pertaining to the earth; earthly: opposed to celestial; also, pertaining to the land* area as distinguisht from the water^area of the globe, or to the land or earth as distinguisht from, or as contem- plated from, the air or atmosfere.
tertial 'tBzfel n. a tertiary flight^ ether ; one of the pennae or large tethers of a bird's wing of the third set, which grows on the elbow or upper arm; a tertiary.
tertiary 'tozS^en n. a tertiary flightef ether; one of the remiges or wing^fethers seated upon the upper arm or hume- rus of a bird; a specialized inner secondary; one of the innermost remiges of the pteryla alans; a tertial.
test-balloon 'test-ba^uun n. a small balloon or inflated bladder let fly in the air to test the direction or velocity of the wind.
tetrahedral / tetj3 / hii-dr9} adj. pertaining to a tetrahedron or to a system of forms to which the tetrahedron belongs : as, Bell's *tetahedral kites.
tetrahedron ^etr^'hii-dron n. [ploral tetrahedra, tetrahe- drons'] a selid figure or ferm comprehended under, or bounded by, four planes; also, the regular tetrahedron whose sides are four equilateral triangles; the triangular pyramid.
thermogram '9B:z-m3,gzaem n. the sheet record of a self* registering thermemeter.
thermometer Goz^memi-taz n. an instrument for mesunng temperature, as of the atmosfere.
blackfbulb thermometer in vacuo, a ferm of solar^radia- tion thermemeter originated by John Herschel; a mercurial
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