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tower crane 
Crane used on construction sites with a usually horizontal jib mounted on top of a tower.
counterjib
Metal lattice that supports the ballast.
operator’s cab
Cab at the top of the tower from which the operator manipulates the crane.
tower mast
Metal lattice of varying height that supports the jib.
counterweight
Blocks of concrete stacked at the base of the tower to stabilize the crane.
crane runway
Girders along and under which the trolley runs.
hook
Strong curved piece of metal for suspending the load.
hoisting block
System of pulleys that work with the trolley pulley to improve leverage to lift heavy loads.
hoisting rope
Durable cable of variable length for manipulating loads.
trolley pulley
System of several pulleys that together enhance leverage.
jib
Metal lattice that pivots on the tower and lifts and extends the hoisting system.
trolley
Vehicle running along and under the jib; the hoisting rope is suspended from it.
jib tie
Metal cable that distributes the tension.
counterjib ballast
Concrete mass attached to the counterjib to balance the weight of the jib and its load.
