Show SPEED IN HIGH ALTITUDES an aeronautical theory that Is bornt boragi out by the migrations of birds the statement that a flying machine mith a normal speed ot of 40 miles an hour travel at a height of 6 5 miles at miles an hour made by dr graham dell bell iq ii supposed sup pored by 1 an ornithologist doctor bells view MCW which depended on a prolonged course of scientific inquiries was a is that the tha speed of an aeroplane increased in more or less jess definite ratio as tile the height from the earth increased the thinner the air the faster the aircraft that birds ue this quality ot of the air nonn no seems probable some ol of the tha migrant arming in england have hae been observed to dive dhe donn don from an all incalculable height as has often been observed in Heli goland that the xeal eak liters fliers should cross the north sea in one dash has seemed an in soluble asters ms because it has necee stated the theory theor that the are endowed at that moment nith a sudden access of power may hay it not be that then only chev find themselves in the tha thinner higher air til ivich ire are the most rapid liters flyers of all for the most pirt part ly baher than other birds cranes have been seen to cros the suris sun s disk at an estimated height ol of 5 ai miles and others have based pa ased over clear the highest mountain ranges the verdict of 0 one of the ba b A stu dents of migration is that without ascending Tc aRc ending to a considerable attitude altitude the migration of many birds bould be dimply impossible that very poor fly flier er the corn corncrake crake ini his tran trifled trie aled led the impossible distance of 5 miles it is true that main birds haie hae been ob observed sered to fly fl low during migration especially liae been seen cen migrating at a ION ov ele elevation aaion and andeen ci ell to cover miles an hour london adall |