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JWV I I rehears i (toilers i s this ye liresentat ipal part -giving lore sing ore it you ifrere privileged to visit a cersection of Langley Field Virginia you might imagine yourself to be in a “toy city” of gigantic size and weird appeal ance You would see a giant “medicine ball” higher than a three-stor- y besides a number of building enormous structures containing model airplanes which circle and soar in very much the same fashion as if they properly belonged in a deluxe toy department of an department store But this is no play place It is the research center maintained by the National Advisory Committee for Aeronautics Here in recent months many gpectacular additions have been made to the world’s finest airplane testing equipment The giant “medicine ball” is part of the new fiee-fligwind tunnel The safety of airplanes in flight is intimately associated with the stability and control characteristics they exhibit in responding to the maneuvers imposed by the pilot lor this reason problems of stability and control are among the most ( 20 IT1'tain Its s charm menus r of ‘The ed e tglish of operas ' Hillam rod uc t tor of the o scnmidt ultra-moder- Doroth Norman i Norma s Miss $ kf st airs o tv 1 C olvn S St Earl Di s Merrill Frank harp and d At Right bv the airplane Tunnel In the f M orld Note the Size of the Two Men Also the t Full-Size- weeks ago Testa alieady made indicate that this tunnel closely appioaches actual flight conditions An examination of the flow required in the building housing the tunnel led to the adoption of a steel sphere to make possible a unifoi m ri turn flow The steel sphere is 60 feet in diameter and can be supplied with air compressed up to two or more atmospheres in which the operators will work Here likewise a decompression chamber is provided so the operators ran return gradually to normal atmospheric pressure The tunnel itself mounted on a steel framework inside the sphere has a test section diameter of 12 feet and is about 30 feet long The drive consists of a power electric motor turning a 15's foot diameter piopcller The whole apparatus is mounted on bearings so that the tunnel can be tilted through 600-hor- free-spinni- Propeller Research Tunnel to Be I sed for Studving the Mind Resistance of Ingtne (ow lings and Fuselages The Throat of the Tunnel Is 20 Feet in j T X k a wide range of angles to coi respond with the angle of glide of the model M hen an airplane or model glides steadily in free air it travels along an inclined path descending slowly as it moves foiwaid tapidly By setting the tunml at the correct angle and blowing the wind uphill as rapidly as the model would glide downhill it is possible to make the model glide fietly and steadily in the test section of the tunnel and this is the pi ineiple of opei ation about which this novel wind tunnel is designed The models usid m the tuniul must be specially built to duplicate on a small scale not only the shape of the airplane but also the distribution of weight in the wings and fuselage The motions of the model and the airplane will then be the same both in lelative propoition and size Two opeiators are required to run the tunnel One of these contiols the angle of tilt and the air speed thus assuring that the model will neither rise nor descend nor move forward nor backward The second operator is the pilot who actually flies the model during the pel lod of its test flight in the wind tunnel Rid- full-size- jjl i t t Below the Giant “Medicine Ball” The Two Men One Standing on lop of the Sphere and the Other on the Ground M ill Give an Idea of Its Immensity Ci The New Pressure Tunnel 60 Feet in Height Mhere the Solutions of Various Propeller and Ming Problems Are Being Sought ing in the “cockpit” equipped with an obsei v ation window just beneath the test chamber the pilot flies the model by operating switches connected with a fine trailing wire to electromagnets in the model These opeiate the control surfaces M ith this tunnel it will be possible not only to give pilots a general "feel” of the flying and handling charactenstics of a new airplane before they ever take it up but it will also be possible to obtain accurate recoi ds of the motion of planes w ith various degrees of stability under the action of known amounts of conti ol application Through such reseaich the new free flight wind tunnel gives piom-ls- e of the development of new design standards for stability and control that will lesult in marked impiovemont in the safety of future auciaft Almost any red blooded youngster boy or girl to say nothing of the aeronautical engineer would be fascinated with wind tunnel Here the realistic looking models of all manner of airplanes are launched in a spin in the rising air stream and every maneuver of the spin is seen from the observer’s w indow After the spin has become fully developed a clockwork mechanism con- tained within the model automatically moves the controls foi lecovery from the spin the resulting effects being recorded camera By such by a motion-pictur- e tests as these it is possible to determine the spinning characteristics of a new design before the first airplane of the tvpe is built If the spinning characteristics piove dangeious further investigations aie made to deteinnne modifications that will correct the difficulty along these lines as- sures the elimination of designs that might later prove costly and hazaidous One of the most important problems affecting the safety of airplanes is their ability to recover ftom the deadly tail spin Mljen It is realized that the tail spin has been the cause of most an plane accidents the importance of assuring that new planes will be capable of recov- - Milestones of Science fr tic lev been shown to be important in controlling radiation principal means of body heat loss and throws new light on the piohlim of radiant heating which some sc ie ntists believe w ill revolutionize pres-- e nt heating and air conditioning methods EM type of traffic light recently ANpatented and based on a clockwise changing of light indicated by a hand with an upper green a lower red and was reintc mediate yellow sections cently appioveel by Dr Howard D Falling of tincimiati University as causing less stiain on the nerves ORDING to a report of the I At Agriculture orest Department S ( 1 Service 21980600 acres of timber weie buined by 185200 forest fires in 1017 with a damage of $20668880 The 1917 firts weie 18 per cent less than those in 19 !6 and the acreage burned only slightly more than half Eggs Can Have Red White or Blue Yolks you find a gieen egg IFbreakfast toast some upon vour morning don’t blame it on the night before Rather put all the blame on science For it was science that discovered a wav to change the color of your bieakfast egg to match your mood of the moment lor instance if you feel blue when vou awaken you mav order an egg with a blue yolk Or if vou’ie in a gay mood perhaps icd would be moic appi opriate Or it might even be pure white if you prefer no color at all In addition you may lest assuied the Now You Can Play Hockey All Summer On “Hot Ice” That Doesn’t Melt made ICE novel fiom photogiaphie hypo’’— sulphite of soda— provided the setting for nice California leeently The hypo was first meUcd in a large kettle over gas jets fed by cylinder and was then poured from buckets in sections over a wooden floor ( racks were smoothed down with an electric iron skating stunt at full-scdl- e d N e Easily the most spectacular part of wind tunthe "toy city” is the nel Truly a man seems but a mite in this the largest wind tunnel in the world hull sized airplanes can be tested here Each plane is supported m a jet on struts The air stream in this unique stiucture is 60 feet wide and 30 feet deep Tw o 35 H foot pi opellers operated by 4000 horsepower electric motors produce a wind of 118 miles per hour past the airplane Today aeronautical engineers are designing planes to fly 400 to 500 miles per UOUi Li hi free-spinni- learn more of the human body ’a physioleigical ie action to its atmospheric surrounding scientists in a test room at the t olle ge of Medicine University of Illinois A hu ago no asui c liange s in skin temperatuie and blood circulation to find the air condition considered ideal for health and comfort In this picture "exploring buttons” attached to six 'diffeicnt parts of the subject's body (foichead abdomen finger toes wrist and thigh) record the sensitivity of the skin to air controlled at different tempciatures and The hands and feet have humidities military commercial and privately owned aircraft -- 9 Diameter Body Reacts to Air Conditioning lo' g maneuver ery from this is apparent During recent months this problem has been extensively investiwind gated in the NA CA tunnel and the results have been carefully correlated with flight expenence on a number of airplanes This is another step in improving the safety of death-dealin- er has devoted much effort to reseaich along these lines and recently completed the free flight wind tunnel to provide a completely new and previously untiied method of attack on these problems Construction was staited in 11U7 and survey flights were begun only a few th Plane d Mounted for Test The Artificial Air Storms Created Here 4re 60 Feet Wide and 30 Feet Deep A C A DuringrecenttearstheN rc to1" Largest Wind n important dealt with the V e Synthetic palm trees stuck in the sand gave a tropical setting The “lee” solidified in an hour providing a good skating surface on which many exciting hockey games between girls' teams are now being played eggs in aspic you have planned for the luncheon you arc giving will conform to vour chosen color motif for now you nmv order them anv color 1 he remarkable discovery is the work of an experimental food farm at St I enns The original idea was not necos-saul- v to make radical changes in the time honoied ptoduc t put out by the hen but to produce unifoi mly better eggs This was to be attained by evolving the veiy best food possible for the hen But tho hen played a trick on the watching scientists After a scries of experiments with feeding different rations she startled them by switching color under their very eyes 1 irst thoie wore green yolks in her eggs On another diet she produced blue yolks On still another they were red then white And strange to relate there was no difference in the taste or the quality of the eggs sat Ns tin nit ir Make Brfirve l’alm I rees Being Net In band Around Outdoor Ire Kink ( on- isting of a Portable Basketball I lemf Covered with I’hntographrr a Ilvpo Kink for SkatIn Preparing the ’llnt-Aee- ” I ing the Ilvpo Is 1 irst Melted Down in a arga Kettle Over Jeta led bv (aa from a Nrarbf f finder v Is 'Ihen Poured Over the Mooring (are Being Taken to See That It la lirnljr Distributed I iiiiiel Htpo M ooelrn Basketball The As the Ilvpo Sets a lew ( racks and Bough Spots Msy Develop but Ihrse Are Aery I asily Smoothed Out with an Lleetric Iron So Smooth and Hard Is the ’Ihpc Able to I’lav Hoe ke y on Its Surfare Though Ihrjr M rra Skating on Krai Ir (iris tre fi" t 1)lr Just aa W |