Τhe sub-divided wheel of Philon (variation of
''polykadia'')
Popular machine for pumping water of medium
differences in height that is used even today. It consisted of a large rotating
radial wheel with embedded wooden containers which had an opening at the upper
part for the inflow of abstractable water when they were at the lower point in
their course and for the outflow of water when they were trapped at the higher
point. The required energy for the movement of the wheel came from the tread of
a worker on the incorporated steps in its circumference or a cooperating
treadmill (foot-powered wheel).
SOURCES: "Philon of Byzantium, Pneumatics,
61", "Vitruvius, On architecture, X 4"
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