attained, and also carries the motive pulleys, PP'. Figs. 1 and 2 show
the profile of two of these opposed cam-wheels--the arrangement by means
of which two rows of dots (odd and even) are laid down upon the tissue
during one revolution of the shaft or drum, A. Each of the wheels
carries three cams (Figs. 1 and 3), the first, (_a_), corresponding to
the punching; the second, (_a'_), to the moistening, and the third,
(_a''_), to the gluing down of the dots.

The annexed figure, one-quarter actual size, shows in section the
details of the cutting mechanism. To each cam-wheel there corresponds
one punch, and the eighty punches are arranged side by side and parallel
upon a shaft, B, a spring, _b_, holding them constantly against the
circumference of the cam-wheels. In Fig. 2 only one of these details is
shown. The punching arrangement consists of an ordinary punch, _c_, of
variable diameter, screwed to the extremity of a tube, _d_, which is
itself suspended from the end of the lever, _p_, but which can receive
from it at the desired moment the pressure necessary to effect the
cutting. The vertical position of these multiple tubes is insured by
a guide, _e_, which is thoroughly indispensable. Through each of the
tubes, _d_, there passes a plunger designed for expelling from the punch
the piece that has been cut out of the velvet, and for gluing it down to
the fabric. The two small springs, _b'_ and _b''_, tend continually to
lift the tubes as well as the plunger. The whole mechanism is affixed to
solid cast-iron frames, and the machine itself may be mounted on wooden
supports or a metal frame.

The punching is effected on a bronze straight-edge, C, which slides in a
cast-iron channel, D. This presents alternately, in its movement, entire
and punctured spaces, the former for receiving the blow of the punch and
the latter for allowing passage at the desired moment to the plunger