In merchant ships supports are needed for the derricks, and masts have developed in size, shape, number and strength according to the weights to be lifted and the number of holds.
Inqanawa yeMerchant exhasa imfuno zesilenge, kunye nepali ende eneflegi ekhula ngokobungakanani, isakheko, nenani lobukhulu ingangobukhulu obunyuswe ngokwenani lokubamba.