Full Circle Derrick, mounted on concrete base.Capacity up to 4 yd. bucket.. Hinged Boom Tower Cranes Up to 50 Tons Capacity-Stiff Leg Derricks Up to 150 Tons
This meant that, in comparison to the construction of the ancient Egyptian pyramids, where about 50 men were needed to move a 2.5 ton stone block up the ramp (
(also known as a 'rated capacity chart') setting out how the crane lifting capacity varies depending on how the crane is set up i.e. how far the boom is