These objects may be effected in several ways; that is, the machinery
may be variously constructed, and still embrace the principles proposed.
_Fig._ 1211. shows one mode:--_a_, is the friction wheel; _b_, the front
drawing roller, placed in the drawing frame in the same way as usual;
the larger wheel _a_, constituting the lower roller of the pair of front
drawing rollers; _c_, and _d_, are the pair of back drawing rollers,
which are actuated by geer connected to the front rollers, as in the
ordinary construction of drawing machines, the front rollers moving very
considerably faster than the back rollers, and, consequently, drawing or
extending the fibres of the sliver of wool, as it passes through between
them; _e_, is a guide roller, bearing upon the periphery of the large
wheel; _f_, is a tension roller, which presses the fibres of the wool
down upon the wheel _a_.