A visual history of giant spheres.  OCT 26 2007

A visual history of giant spheres.

1850: Baron Haussmann and engineer Eugene Belgrand design the modern Paris sewer system.The sewers are regularly cleaned using large wooden spheres just smaller than the system's tubular tunnels. The buildup of water pressure behind the balls forces them through the tunnel network until they emerge somewhere downstream pushing a mass of filthy sludge.

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