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Transcript of Chinese Windlass
used since Roman times
very high mechanical advantage: The Simple Windlass rotational motion History: Chinese Windlass 1860: the Second Opium War
Britain and France invaded Peking (Beijing)
some British soldiers noticed the Chinese windlass
used to raise and lower drawbridges
much higher mechanical advantage Chinese Windlass uses two cylinders of radius R and R'
the rope comes off the smaller cylinder and onto the larger cylinder
larger cylinder winds up more rope than the smaller
slow but powerful Materials force produced force applied two types: simple and Chinese (differential) pipes and end caps
PVC reducer fitting
pulley Mechanical Advantage Gained: 2R _________ ( r - r' ) Works Cited Gurstelle, William. "The Chinese Windlass." MAKE:
Magazine 2011: 170-75. Pt. 25 of a series, begun 2005. MAKE: Magazine. Web. 26 May 2013. <http://blog.makezine.com/projects/make-25/the-chinese-windlass/>.
Lueger, Otto. Illustration for differential windlass. N.d.
Illustration. Lexikon der gesamten Technik.
Medieval Builders' Windlass. BBC, n.d. Web. 26 May
objects/pB9o-yDFQPm4ZiMXxjZfQA>. vertical motion larger radius: more effective ____________________________ (derived using concepts of work and the conservation of mechanical energy)