英語作文：The origin of Refrigerators

　　By the mid-nineteenth century, the term icebox had entered the American language, but ice was still only beginning to affect the diet of ordinary citizens in the United States. The ice trade grew with the growth of cities. Ice was used in hotels, taverns, and hospitals, and by some forward-looking city dealers in fresh meat, fresh fish, and butter. After the Civil War,as ice was used to refrigerate freight cars, it also came into household use. Even before 1880,half of the ice sold in New York, Philadelphia, and Baltimore, and one-third of that sold in Boston and Chicago, went to families for their own use. This had become possible because a new household convenience, the icebox, a precursor of the modern refrigerator, had been invented.

　　Making an efficient icebox was not as easy as we might now suppose. In the early nineteenth century, the knowledge of the physics of heat, which was essential to a science of refrigeration, was rudimentary. The commonsense notion that the best icebox was one that prevented the ice from melting was of course mistaken, for it was the melting of the ice that performed the cooling. Nevertheless, early efforts to economize ice included wrapping up the ice in blankets, which kept the ice from doing its job. Not until near the end of the nineteenth century did inventors achieve the delicate balance of insulation and circulation needed for an efficient icebox.

【英語作文：The origin of Refrigerators】相關(guān)文章：

英語作文Origin of Christmas及譯文05-21

The Origin of Chinese New Year英語作文03-05

英語作文范文英語作文08-12

學好英語的英語作文11-05

學好英語英語作文11-05

中考英語話題作文中考英語作文-英語作文04-12

英語作文代溝的成因英語作文04-24

英語作文范文要英語作文,08-12

關(guān)于英語寫作的英語作文10-11