They say a picture is worth a thousand words.
This is some icelandic that I prepared both combed and carded:
Lashed on to the double row Viking combs:
And pulled into a slyver
The same roving carded on hand carders:
Carded into a rolag on the left, Carded and pulled into roving on right:
And spun. The slyver spun worsted on the left and rolag spun woolen on the right: