Pulley systems are simple machines that make lifting heavy objects easier. They consist of a rope or cable that passes over one or more wheels (pulleys). A single pulley changes the direction of ...

The solution? A pulley system to make everything easier. The concept is simple. [Barnso]’s system uses three pulleys. The headphone cable goes to the PC, and then runs over the first pulley.

This Roman wooden pulley system was found at Bar Hill Roman Fort ... which would have helped the Roman army of occupation to build their immensely imposing and important structures in the Scottish ...