"two heads" or "three heads." It will be seen from the large
pressing rollers that there are two pairs; hence the machine is a
"two-head" drawing frame.

The slivers from the first drawing frame are now subjected to a
further process of doubling and drafting in a very similar machine
termed the second drawing frame. The pins in the gills for this
frame are rather finer and more closely set than those in the first
drawing frame, but otherwise the active parts of the machines, and
the operations conducted therein, are practically identical, and
therefore need no further description. It should be mentioned,
however, that there are different types of drawing frames, and their
designation is invariably due to the particular manner in which the
fallers are operated while traversing the closed circuit. The names
of other drawing frames appear below.

Spiral or screw gill;
Open link chain;
Rotary;
Ring Carrier
Circular.

For the preparation of slivers for some classes of yarn it is
considered desirable to extend the drawing and doubling operation in
a third drawing frame; as a rule, however, two frames are considered
sufficient for most classes of ordinary yarn.