to worms on longitudinal shafts. These worms engage with worm wheels on
cross shafts, which are provided at their outer ends with change wheels
engaging with other change wheels on the arbors of the bottom feed and
delivery rollers, D and E.

[Illustration: FIG. 2.--"SENSIM" SCREW GILL--SECTIONAL ELEVATION.]

The speeds are so adjusted that the fibers are delivered to the first set
of gills at a speed approximately equal to the speed at which these start
their traverse. The gills in the second set begin their journey at a pace
which slightly exceeds that at which those of the first finish their
traverse. These paces are of course regulated by the class and nature of
the fibers under operation. The delivery rollers, E, take off the fibers at
a rate slightly exceeding that of the gills delivering it to them.

[Illustration: FIG. 3.--"SENSIM" SCREW GILL--PLAN.]

In the ordinary gill box, the feed and delivery rollers are fluted, in
order the better to retain in the first instance their grip upon the wool
passing through, and in the second to enable them to overcome any
resistance that might be offered to drawing the material. It thus often
happens in this class of machines that a large percentage of the fibers are
broken, and thus much waste is made. The substitution of plain rollers in
both these positions obviates most of this mischief, while in combination
with the other parts of the arrangement it is almost precluded altogether.

It will be obvious from what we have said that the special features of this
machine, which may be summarized as, first, the use of a screw thread of
graduated pitch; second, an increased length of screw action and an
additional number of fallers; and third, the use of light plain rollers in