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Block and tackles (Polyspasta)

They consisted of the combination of a fixed and a movable “pulley” in an interdependent system by the lifting rope. In the wooden or metal sheath of each “pulley” one or more axles were fitted and around each one rotated one or more pulley-wheels. “Trispasto” was the system with three wheels (two in the top “pulley” and one in the bottom). “Tetraspasto” was the system with four wheels (two in each “pulley”), etc.

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