Cranes
Show: Modern Marvels --> Season: 9 - Season 9
AirDate: 10/8/2002
Runtime: 44
Voting: 0 (0)

Overview: One of the most useful machines ever created, the crane is a simple but important combination of the pulley and the lever. Though cranes have been helping us build civilization from at least the time of the Egyptian pyramids, the modern steel-framed construction cranes are a relatively recent development. Put on your work boots as we ride through the history of cranes from ancient days to skyscraper construction sites, ocean-freighter docks, and the International Space Station.