Mast Cranes ~ these are similar in appearance to the familiar
tower cranes but they have one major difference in that the mast
or tower is mounted on the slewing ring and thus rotates whereas
a tower crane has the slewing ring at the top of the tower and
therefore only the jib portion rotates. Mast cranes are often
mobile, self erecting, of relatively low lifting capacity and are
usually fitted with a luffing jib. A wide variety of models are
available and have the advantage over most mobile low pivot
cranes of a closer approach to the face of the building.Cranes