. A history of the United States. the automobile. The manufacturersof every country quickly adoptedthe German plan, and improvedupon the first clumsy cars. Work-men and inventors of every coun-try rivaled one another in effortsto produce the best. The gas-engine is also rapidly being usedto drive farm machinery. Goodswhich men once carried to marketon their backs, and which lateroxen or horses hauled, steam, gas,or electric cars now take moreswiftly and more cheaply. The Aeroplane. — For centuriesscientists dreamed of an invention by which man could travel through the air hke a bird inflight.
. A history of the United States. the automobile. The manufacturersof every country quickly adoptedthe German plan, and improvedupon the first clumsy cars. Work-men and inventors of every coun-try rivaled one another in effortsto produce the best. The gas-engine is also rapidly being usedto drive farm machinery. Goodswhich men once carried to marketon their backs, and which lateroxen or horses hauled, steam, gas,or electric cars now take moreswiftly and more cheaply. The Aeroplane. — For centuriesscientists dreamed of an invention by which man could travel through the air hke a bird inflight. Balloons were made in the eighteenth century,but they, like the sailing vessel, were at the mercy of everywind. European inventors were quick to apply the lightgas-engine to the balloon, changing its shape so that it wouldbe more manageable. The hghtness of the gas-engine madepossible what seems the most marvelous invention of all. In1905 the Wright Brothers, after patient trials, made a suc-cessful aeroplane or An Aeroplane 472 THE NEW METHODS OF WORKING Expositions. — Several times since the Centennial Expo-sition other expositions have been held, which gave thepeople opportunities to see what rapid progress was beingmade, not only by Americans but also by all nations. TheWorlds Fair or Columbian Exposition at Chicago in 1893was intended partly to celebrate the 400th anniversary ofthe discovery of America. Eleven years later an expositionat St. Louis commemorated the looth anniversary of the pur-chase of Louisiana, and the following year one at Portland, »k?^^tl>^^
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