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How does a tower crane work?
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A tower crane moves materials on a building site. A hook is suspended from a trolley that can move along the jib. The jib can also swing around. The hook is raised by a motor which winds a cable around a drum. The open frame of the tower and jib saves weight.
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Previous:
Back
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Book:
Best Ever Q&A
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Section:
Science & Technology
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Chapter:
Machines
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