Page:Dictionary of aviation.djvu/141

 DICTIONARY OF AVIATION 117

carried in a balloon and used for grappling the earth in landing; a grapnel; an anchor.

graveyard 'gzeev,ja:zd n. a portion of an aviation^ground or flying^course which has gaind the reputation for being a sert of cemetery or place uuhere, en account of tjecherous air^currents, rough ground, etc., the machines are apt to fall and go to smash and their occupants be kild or come to grief.

gravitation 'gzaevi,tee-$9n n. the action or process of gravi- tating; the tendency which material bodies have of attjact- ing one another, of tuhich gravity, or the fall of bodies to the earth, is an instance.

gravity 'gzaevi-ti n. the quality of having weight or of tend- ing downward or toward the earth; the earth^f orce ; also, weight, heviness ; also, gravitation. center of gravity, see under center.

specific gravity, the degree of gravity tuhich specifically characterizes a given material substance or body; the rela- tiv heviness or weight of any particular portion of matter, usually exprest by the ratio of its weight to the weight of an equal volume of water (in the case of solids and liquids) or of hydrogen (in the case of gases).

gravity-correction 'gz3eviti-k9,zek$9n n. a correction of a reading of a standard mercurial barometer on account of the variation of the force of gravity at different altitudes and the resulting changes in the pressure of the atmosfere.

gregale gzi'ga:-li n. a dreded northeast wind in the island of Malta and other Mediterranean regions, resembling the tr.amontana wind of Italy.

ground ground n. the solid part of the earth's surface; any portion of the land^surf ace ; firm land; also, a tjact or re- gion.

ground attitude, see under attitude.

ground-current 'gzaund^ezant n. an air^current near the the surface of the ground or earth; a current or stream of air due to the influence of the earth or objects thereon upon the motions of the atmosfere.

ground-level 'gzaund,lev9l n. the level of the ground; the general level of the land^surface in a given locality.

guide-line 'gaid,}am n. a line used as a guide-rope en a balloon ; a guide#rope.

guide-rod 'gaid,zed n. one of the reds used in a flying* model devised by H. Sutton of Australia, about 1888, for guiding or directing the stroke of the wings.

guide-rope 'gaid,zoop n. a long rope attacht to a balloon and allowd to dangle or hang below, so that when the balloon

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