186 DICTIONARY OF AVIATION
fluid resistance, the resistance efferd by a fluid, as air,
to a bedy moving in it. resisting-surface zi'zisirj,S8zfis n. a surface which resists
atmosferic pressure. resonator 'zrez9,net9z n. a device which resounds, as that
used on certain Chinese kites, producing an intense
plaintiv sound which can be heard at a great distance. re-start ,zi'sta:zt intr. start again, as en a flight; set out
once more. resting-place 'zestirj,ptees n. a place or spet upon which a
balloon or airship rests, er may rest; a landing-place; an
alighting-place. restraining-rope zi'stee-nirj,zoop n. a short rope attacht
to a flying-machine and restraining or preventing it from
rising too far, as in the circular testing-railway proposed by
C. Weyher in 1884.
return-trade zi'tB:zn,tr,eed n. same meaning as antitrade. rhachis 'zee-kis n. same meaning as rachis. rhipiptera zi'pipta-za n. pi. a family of heteremerous cele-
eptera including the genus Styleps; the rhipideptera ; the
stylepidae. rhumb-line 'zAm,lain n. [also spelt rum^line} a line on the
surface of the earth which cuts the meridians at a constant
angle ; a loxodrome, or lexodremic line. rib rib n.
1. one of the curvd cress-pieces in the frame of a kite or other aerofoil : as, the main *nb of a kite.
2. one of the strips or rods extending between the front and rear spars of a main-plane or wing in an aeroplane or other flying-machine and helping to support it and main- tain its peculiar archt form or outline; a rib-piece, compare stiff ener, wingfbar (sense 2}.
3. a rib-like stiipe of cloud, such as a Noah's Ark or polar band.
ridge zids n. the highest part of the roof of a bilding; the
meeting of the upper ends of the rafters. rift rift n.
1. an opening made by riving or splitting; a fissure, a cleft : as, a *nft in the clouds.
2. a discontinuity in a fluid caused by a bedy coursing swiftly thru it.
right-and-left ,zai-tn'}eft adj. side-to-side.
rigid 'zidsid adj. characterized by having a rigid or stiff gasbag frame, as a Zeppelin airship; of airships of this type : as, a *rigid balloon ; the *rigid type of dirigible : distinguisht from non-rigid and semi-rigid.
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