from which 15 cwt. of charcoal is obtained. The fuel for burning the
charcoal is derived from the ash pit refuse, some selected loads being
for that purpose passed over a sloping screen fixed between the upper
platform and the furnace floor, the fine ashes which pass through the
screen being taken away to the manure heaps, and the combustible parts
to the furnaces of the carbonizer. In this way a good deal of the ash
pit refuse is got rid of; it is often one-twelfth part of the whole
quantity.

The carbonizer and the destructor are set 33 feet apart, to allow room
for drawing the furnaces and for the mortar mills, but the space is
hardly sufficient. One man is employed in attending to the carbonizer.

Besides the openings at the top of the destructor through which the ash
pit refuse is fed into the cells, there is a larger opening in each
cell, kept covered usually, through which bed mattresses ordered by the
medical sanitary office to be destroyed can be put into the cells. These
openings are midway between the central openings and the furnace doors,
and whatever is put into the cells through these comes into immediate
contact with the fire. Advantage is taken of these openings for the
destruction of dead animals and diseased meat, and as much as 20 tons in
a year have been passed through the destructor.

The whole works are roofed over. The lower floor is open on two sides,
but the upper one is closed in, with weather boarding at Burmantofts and
with corrugated iron at Armley Road. At the former place the works
were in some measure experimental, and the platform was constructed
of timber, but at Armley Road it is of plate-iron girders, with brick
arching, weight being considered advantageous in reducing the vibration
of carting heavy loads over it.