Show valuable airplane device of all tile the inventions conceived during the lust list decade in the hope ot of decreasing creasing the hie landing sliced ot of airplanes none has hag promised more in preliminary tests than a device recently evolved liy by the united states bureau of standards says popular mechanics magazine it Is nothing more than a simple variable camber ril rib billich is used instead of the ordinary rab in the hie construction of one plane of a I 1 biplane or of the top and hollom planes of a one pe lie of construction Is that the now nose of if this liis flexible rig is fixed to jhc front spar chile bile the tailpiece is rigid and slides on oil the lie rear spar an ollier peculiarity Is that tile the ril rib structure t 11 lie tween the spars is i s normally liikal or r but is deformed by air pres uie suie until it lic be conics it a rib of most mort pronounced c camber tuber |