rachis

‘zee-kis n. [also spelt rhachis] the stem, shaft, or scape of a bird’s fether, as distinguisht from the vextlla, vanes, or webs; in quillefethers, the upper opaque part of the stem which bears the vexilla or vanes, as distinguisht from the calamus or quill. racing-aeroplane ‘zee-sin,ee-aco-preen nm. same meaning as racing-plane. racing-machine ‘zee-sin-ma,j1in n. an aeroplane or other airzmachine used for ractng; a speed machine; a racer. racing-plane ‘zee-sin,preen n. an aeroplane flying-machine designed for racrng or speed; a racitng-machine of the aeroplane type. vadiation,zed i’ce-San mn. the act of radiatrng; the state of being radiated; the amount of heat-rays or other form of radiant energy shot forth from a given source. atmospheric radiation, the thermal radiation from the earth’s atmosfere; the radiant di tpation of heat from the atmosfere. solar radiation, the radiation of the sun as mesured by the heat the earth receivs from it. coefficient of radiation, the constant numerical mesure of radiation; the unit of radiatrng-power, as of a grtven portion of the earth’s atmosfere, or of a given quality of air. radiation-fog,zed i’ce-San,fog n. fog caused by radiation of heat.en low grounds. radiation-thermometer,zed i’ce-San-oz,mem i-tai on. a > mercurial therm-meter enclosed in a gla vacuum-tube, used for me suring solar radiation. radiation-weather,zed i’ce-San,wedaz n. wether due to, or controlled largely by, radiation of heat from the ground; the wether characteristic of an area of high atmosfersc pre ure, clear sky, and light winds, varying with the thermal radiations from the earth. radiometer,zed i’emi-tai. an instrument consisting of a frame supporting mica-vanes which are free to revelv in a vacuum, used for me suring or dem onst gating the effects of radiant energy, as light or heat. radius ‘zee-di-as n. [plural radii] one of the prece es on each side of the upper berder of a bird’s fether; a barbule. aero dromic radius, the distance in a stzaight line from the ma -center of an aerodone to the aero dromic wing center. 2 aerodynamic radius, the distance in a straight line from the ma -center of an aerodone to the aerodynamic wing center. raft za:ft 7. aerial raft, a flat structure capable of floating xin the air; an aeroplane. vail zeet n. see starting-rail and launching-rail. rain zoon. water in the form of drops resultrng from the cendensation and aggregation of vapor, falling thru the lower regions of the air or atmosfere; also, the descent or fall of water in this form; and, further, a shower, period, or season characterized by the fall of water in this form. belt of rains, the belt or long narrow equatorial region between the trad-winds, nearly encircling the earth, characterized by frequent rains thruout the year; the equatorial rain-belt. black rain, rain or rainwater which 1s somewhat black, or which leavs a black restdue owing to the presence of black fungi, black se1l, or soot carried down from the atmosfere.; coast rain, one of the rains characteristrc of the coast or costal regions of a cent in ent or island, usually due to winds blowing off the sea toward the land. convective rain, rain which is due to the cooling of air by expansion when forced upward. by convection-currents. cyclonic rain, rain whch is due to the cooling of air by expansion when forced upward by cyclonic circulation. dynamic theory of the formation of rain, the theory of Espy and others that rain, snow, etc., rs caused by thermodynamic prece es,; monsoon rain, a rain accompanying or due to a monsoon wind. luminous rain, rain characterized by luminous electric discharges or sparks between the drops or between the drops and the ground. orographic rain, rain which is due to the chnhiee of air by expansion when deflected upward by hills or mountains. yellow rain, rain due to the pellen of firztrees, etc., being raised by the wind and afterwards precipitated; sulfur-rain.