48 DICTIONARY OF AVIATION
boundary-circulation / baun-dri-SBzkc.u,lee-$3n n. the
circulation of a fluid along or around a boundary. boundary-surface 'baun-dn,sBzfis w. the surface forming
the boundary between the live stream and the ded#water in
the rear of an advancing aerofoil. bow bao n. [often used in the plural] the front or forward
end of an airship. bowsprit / boo / sp3it n. a large spar or boom which projects
forward from the stem or front of an airship. bow-stick 'boo,stik n. the elastic stick which forms the ,bow
of a bow kite. bow-string 'boo,stirj n. one of the strings, cords, or lines
which is attacht to the bow of a bow kite. box-kite 'boks,kait n. same meaning as box kite, see under
kite. box-kite 'boks,kait adj. of, or consisting of, a box kite, see
under kite.
box-plane 'beks,pz,een n. an aeroplane flying?machine hav- ing planes arranged in bex^like form. brace bzees n. a prep or support; a diagonal compression?
member in the frame of an aerial vehicle. brace-line 'bzees^am n. one of the lines or cords of the
bridle of a kite; a brace. bracing-wire 'bzee-sin/waiz n. a wire used for bracing or
preventing deformation, as in the structure of an aeroplane
flying?machine. brake-rope 'bzeek,zoop n. a rope hanging from a balloon
and used as a brake or to retard the motion of the craft
thru the air. breeze bziiz n. a moderately brisk wind; a movement of the
air not so strong as a gale : as, a stiff *breeze.
fresh breeze, a breeze (numberd 5 in Beaufort's wind?
scale) having a velocity of about 8.8 meters per second. gentle breeze, a breeze (numberd 3 in Beaufort's wind*
scale) having a velocity of about 4.8 meters per second. light breeze, a breeze (numberd 2 in Beaufort's wind?
scale) having a velocity of about 3.1 meters per second. moderate breeze, a breeze (numberd 4 in Beaufort's
wind^scale) having a velocity of about 6.7 meters per sec- ond.
mountain breeze, same meaning as mountaintbreeze. stiff breeze, a breeze of considerable strength or veloc- ity; a strong breeze.
strong breeze, a breeze (numberd 6 in Beaufort's winds
scale) having a velocity of about 10.7 meters per second. bridle 'bzai-dl n. that portion of the gear of a kite by which
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