The process of reinstalling the recently reviewed, polished and measured sheave wheels of the Johnstown Inclined Plane has ...

A pulley is a wheel on a fixed axle. The wheels normally have a groove in them, to guide a rope or cable through. One end of the rope is attached to a load that needs to be lifted. Then the other ...

Although the first innovation was little more than grooved rollers, the miners likely improved this system over the course of ...