of methyls, ammonia, acetates, and methylamine, that the mass shall be
divided as completely as possible, since it then takes but a relatively
moderate heat to completely destroy the organic coloring matter
contained in the wash. The apparatus shown in Figs. 1 and 2 is based
upon this observation.

The wash enters, through the hopper, D, and the valve, z, a long boiler,
B, which is heated by the furnace, F, through the intermedium of a
waterbath, w. An agitator, E, moves the mass slowly to the other
extremity of the boiler, from whence it makes its exit in the form of
dust. To the frame, E, are fixed the scrapers, b, and the interrupted
pieces, a, in front of which are the hinged valves, c. In the motion of
the pieces, a, from right to left, these valves free the apertures
thereof and allow the wash to pass, while in the motion from left to
right the apertures are closed and the valves push the mass to be
evaporated before them.

From any motor whatever, the frame, E, receives a double to and fro
motion in a horizontal and vertical direction, the latter of which is
produced by the rods, f, which are provided at their lower, forked
extremity with rollers, e, over which passes the piece, d, that supports
the frame, E. At their upper part the rods, f, pass through the side of
the boiler, through the intermedium of stuffing boxes, and are connected
by their upper extremities, through a link, with levers, g, that revolve
around the point, h. A cam shaft, M, communicates a temporary,
alternately rising and descending motion to the levers, g, and the rods
f. The same shaft, M, opens and closes the valve, z, of the hopper, D,
and thus regulates the entrance of the wash into the boiler. The frame,
E, receives its horizontal to and fro motion from the rod, l, which
traverses a stuffing-box and is moved by a crank on an eccentric, m. The