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| | Sandia National Laboratories: Features: National Engineering Week : Megoliths to Micromachines |
 | | About 4000 BCE, “British” engineers used the expansion of heated water, together with hammers, levers, wedges, ropes, and rollers, to quarry and move enormous megaliths to Stonehenge and Avebury. |
 | | As timekeeping devices were combined with the compass (220 BCE), astrolabe (225 BCE), and sextant (17th century), eventually overcoming the problem of longitude (1764), profound changes in our understanding of the world were made possible. |
 | | The abacus (400 BCE), in conjunction with Napier’s logarithms (1614), and Babbage’s “Analytical Engine” (1837), led to ciphering machines and eventually the computer, first applied to cryptanalysis and in the development of nuclear weapons. |
| www.sandia.gov /news-center/features/natl_engr_wk_mego-micro.html (1013 words) |
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