There is such a wealth of types, however, that there is space in this chapter to describe in broad outline the main types only and the principal factors affecting their design and operation.
Kukho apho ubutyebi obuziindidi, nokuba kutheni, okokuba kukho izithuba kwesi sahluko esichazwa ngobubanzi bomgca wangaphandle owona ukudidi olubekiweyo lwezinto ezichaphazela ukwenziwa kunye nokusetyenziswa kwazo.