DICTIONARY OF AVIATION 187
rigidity zi'dsidi-ti n. the quality or condition of being rigid; stiffness.
rime zaim n. white frost or hoarfrost, especially the thick hevy frest which forms upon objects from rain or the freez- ing of mist.
ring zii) n. the cencentjating^rmg of a balloon; the concen- tjating-hoop ; the hoop.
rip zip v.
1. tr. tear or cut open; split.
2. be torn or split open; open or part.
rip-cord 'zip,ko:zd n. a cerd in a balloon or airship, in- vented by John Wise in 1844, which, when pold by the aeronaut, will cause the ripping-panel or the gasbag to be ript or torn open, thus allowing the gas to escape and the balloon to descend quickly to the ground; the ripping-cord. ripping-cord 'zipin,ke:zd . same meaning as rip-cord.
ripping-panel 'zipir^paenl n. a panel or str.ip of balloon- cleth in the upper part of the gasbag of a balloon which, by manipulating the ripping-cord, may be suddenly ript or or rent, so as to allow the mflating-gas to escape and the balloon to descend; the ripping-stpp ; a np-stip.
ripping-strip 'ipin,stip n. same meaning as ripping* panel.
ripple-cloud 'zipa},ktaud n. a short-lived cloud formd as if markt by ripples; a waved cloud.
rip-strip 'zip,str.ip n. the ripping-strjp of a balloon; the ripping-panel.
rise zaiz intr. [past participle risen; preterit rose] move up- ward; ascend, mount.
rising-angle 'zai-zir^aengal n. the angle at which rising is done; the angle which a rising aeroplane or glider makes with the direction of flight or with the horizontal; the angle of inclination of an aerofoil adjusted for rising into or thru the air : compare gliding-bangle .
rising-capacity 'zai-zin-k9,paesi-ti n. capacity to rise, mount, or ascend in or thru the air; rising-power; ascend- ing-power.
rising-power 'zai-zir^pau-sz n. power to rise, mount, or ascend in or thru the air; rising-capacity ; ascending^ power.
rising-track "zai-zir^tjsek n. the t^ack or railway by the aid of which a flyingsmachine rises into the air in flight; a starting-tjack ; a launching^rail.
rocket 'zokit n. a tube containing explosivs which, when ignited, propel the tube forward; a sky-rocket. Rackets
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