Download PDF by Dean A. Herrin: America Transformed: Engineering and Technology in the

By Dean A. Herrin

ISBN-10: 0784405298

ISBN-13: 9780784405291

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From a fledgling agrarian country clinging to the Atlantic seaboard in 1800, the USA by way of the 1900s used to be the world's major commercial kingdom, production a 3rd of the world's business output. via approximately 2 hundred images and drawings, the United States reworked: Engineering and know-how within the 19th Century highlights not just the most obvious icons of accomplishment reminiscent of the Brooklyn Bridge and Erie Canal but in addition the advance of the nation's commercial, production, and transportation infrastructure. improvement and innovation in mining; cloth, iron and metal turbines; water remedy, strength and irrigation structures, canals, railroads and bridges all served to remodel American existence. In 1969 the nationwide Park carrier, the Library of Congress, and the yank Society of Civil Engineers shaped the old American Engineering checklist (HAER) application to rfile nationally and domestically major engineering and commercial websites. HAER documentation--in the varieties of measured and interpretive drawings, large-format pictures, and written histories--record for posterity the large historical engineering and business legacy of the us. utilizing those assets, Dean Herrin has created a visible sampler of America's nineteenth-century engineering and know-how that illuminates the scope and diversity of America's business transformation

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Additional info for America Transformed: Engineering and Technology in the Nineteenth Century : Selections from the Historic American Engineering Record, National Park Service

Example text

I see no retroactive way to remedy that situation, and besides, retrofitting history is a bad idea. Affirmative action and the goal of diversity, which have their advocates and strong points in the realm of social policy, have no proper place in the writing of history. If there were few engineers in a given era of a given race or gender category, for example, then that is a relevant fact to point out, but trying to elevate to the status of having major roles people in an early era who had only minor roles is misstating history.

Award inflation, like grade inflation in the schools and universities, has increased in recent decades. It is as if the law of continuity, an essential principle of fluid dynamics, applies here. That law, a derivation of the conservation of matter, states that in a moving stream of fluid, the density times the cross-sectional area times the velocity is a constant, a discovery generally attributed to Leonardo da Vinci (1452–1519). If an airstream flows from one crosssectional area into a section that has four times the area, and if the velocity is the same, then the density of the fluid in that area is reduced by a factor of four.

That law, a derivation of the conservation of matter, states that in a moving stream of fluid, the density times the cross-sectional area times the velocity is a constant, a discovery generally attributed to Leonardo da Vinci (1452–1519). If an airstream flows from one crosssectional area into a section that has four times the area, and if the velocity is the same, then the density of the fluid in that area is reduced by a factor of four. Such a principle is essential to account for the lower pressure over a wing than underneath it and the ability of airplanes to fly.

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America Transformed: Engineering and Technology in the Nineteenth Century : Selections from the Historic American Engineering Record, National Park Service by Dean A. Herrin


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