How inventions impacted the u.s.
Published on Nov 18, 2015
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PRESENTATION OUTLINE
EARLY ERA
Photo by Stuck in Customs
The lightning rod As buildings become taller, lightning becomes more of a threat. Lightning can damage structures made of most materials, such as masonry, wood, concrete and steel, because the huge currents and voltages involved can heat materials to high temperature , causing a potential for fie.
Submarine helped the u.s in world war 1
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The colonial period in America from 1492-1763. Pilgrims arriving on Plymouth Rock. In December 1620, European countries came to the Americans to build up their wealth and broaden their influence over world affairs. Spain were among the first Europeans to explore the New World and the first to settle in what is now the United States of America.
Photo by Michael Taggart Photography
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The evolution of the biggest inventions
Photo by x-ray delta one
