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【答案】应助回帖
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感谢参与，应助指数 +1
毛毛虫和小虫: 金币+100, ★★★★★最佳答案 2015-12-16 09:17:50
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North America is a vast continent
For centuries as United States has taken shape, it's spread westward and beyond toward new frontiers
That spread occured because Americans used an inventive mechanized form of transportation so that large numbers of people and a huge amount of raw materials and finished goods could reach every corner of a growing dynamic nation
In this lecture, I want to examine four key artifacts that tell the story of an America on the move - the Conestoga Wagon, the John Faulton steam locomotive, the Ford Model T, and Charles Lindberg's airplane, the Spirit of St Louis
They take us from the Colonial Era of horse-drawn transport to the Modern Era of inter-continental air traffic
The first of these, the Conestaga Wagon, is not what many people think it is
Now if you've seen a lot of weterns with scences of covered wagons moving across the great prairies, this wagon probably appears quite familiar
Actually the Conestoga Wagon is the forerunner of those 19th Century prairie schooners which was smaller, lighter and usually drawn by oxen
Conestoga wagons originated in the mid-1700's - maybe even a little earlier - near Lancaster, Pennsylvania at the Conestoga River
This one from the National Museum of History is probably built and used in the 1840's and -50's, a little after the heyday of the Conestogans
It is unusually large, 18 feet long and almost 8 feet wide, indicating its intended use - hauling large heavy consignments of freight
The three-member suspension was made of wood while the wheels were typically iron-rimmed for greater durability
Wagons needed to be sturdy
They had to cross streams and shallow rivers, navigate steep mountain passes and deal with rutted roads and deep mud
Notice how the body of the wagon is shaped
It's curved
This is so as the wagon traversed hills and mountains, cargo would shift toward the center rather than slide toward the sides and destablize the wagon
Wagons combined utility with Pennsylvanian German folk art, like you see here with a blue body, red running gear and decorative iron
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![听写 英文视频]()
Conestogan Wagon.jpg
![听写 英文视频-1]()
steam engine.jpg
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