intro3 - Aqueducts Roads & Bridges Dark Ages u Fall...

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Unformatted text preview: Aqueducts Roads & Bridges Dark Ages u Fall Dark Ages (continued) of Roman empire (450 AD) t Contact between Rome and Britain ended t Roman roads, bridges & aqueducts died u Societies u England depended less on slaves (250 people per watermill) watermill) t Early applications w t Later applications w u Wind Power (1100 AD) t Post Mill (Normandy, 1180 AD) t Tower Mill (1300 AD) t Netherlands (1500 AD) u Agriculture t Horse collar t Nailed iron horseshoes t heavy wheeled plough and harrow Dark Ages (continued) u Textiles t Rope driven spinning wheel t Weaving technologies (1300 AD) u Universities founded (Italy, 1200 AD) t Start of a period of higher learning t Beginning of engineering discipline ? THE THIRD AGE The First Machine Age 1 Timekeeping The First Machine Age u Timekeeping u Optics u Crank u Print Chronology u Gnomon Gnomon (Egypt, 1500 BC) u Obelisk u Sundial u Waterclock u Sandglass u Mechanical / Pendulum u Electronic Sundial / Obelisk u Problems with Gnomon t Thin short rod t Did not work at different latitudes w t Exact position of sun’s center t Placed perpendicular to ground Waterclocks & Sandglasses u Reset periodically dependence u Variations with age u Inaccurate u Environment w 2 Vitruvius (150 BC) Schott Cingalese Sand-glass Mechanical Clock Hero of Alexandria u Regulating device t Creates oscillations t Needs energy to stop from running down w u Distribution mechanism t Supplies energy in correct amount and at correct time t Holds energy and allows energy to escape at the correct time - escapement u Indexing & Gearing t Translates time to space 3 Verge & Foliot Anchor Escapement Standard Weight Clock 4 ...
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This note was uploaded on 06/12/2011 for the course EGN 3000 taught by Professor Staff during the Spring '09 term at University of South Florida - Tampa.

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