Reports of the Inspectors of Mines of the anthracite and bituminous ...

No. 12.] Sixth Anthracite District. 229
than lump is taken out by these bars and g-oes into the mud screen
pocket, the himp alone reaching- the platform. On the platform the
lump is divided into pure lump, which g-oes northward to the lump coal
chutes; the slate which goes down the slate chutes into the slate pockets,
and the slate coal which g-oes through the rolls into the mud screen
pocket joining the small coal from the mines.
The pure lump on its way to the pockets can be separated into star
lump and ordinary lump or if there is no demand for either, it passes
through a set of rolls which make steamboat and the smaller sizes.
The coal coming through these rolls passes through an inverted gyrating
screen, which takes out the steamboat coal and allows the finer coal to
go to the upper prepared coal screen. The steamboat coal goes to the
pocket or through a set of steamboat rolls and then into the same prepared
coal screen.
The mud screen coal is screened on two gyrating screens, and is divided
into two parts by a horizontal plane, the upper part makes steam-
boat, broken and egg, and runs dry ; the lower parts makes stove, chest-
nut, psa and buckwheat, and runs wet. The eastern and western halves
of the breaker are exactly alike, one mud screen delivering coal to the
west and the other to the east. The steamboat coal goes down a chute
provided with a slate-picking chute where the pickers take out the slate
and slaty coal and allow the pure steamboat coal to pass down a chute,
either into the steamboat pocket or into the same steamboat rolls re-
ferred to above, and what passes through these steamboat rolls goes to
the upper prepared coal screen referred to above. The slate and slate
coal go to a platform where they are inspected, the pure slate being
turned into the slate pocket and the slate coal going to the rebreaking
plant on the ground on the level of the railroad, the same thing takes
place with the broken and egg coal.
The stove coal on each side of the breaker passes over the automatic
slate pickers, the round coal going to two jigs on each side and the flat
coal to a third jig on each side. The same thing takes place with the
chestnut. The pea coal goes directly to two jigs on each side of the
breaker. There are six stove, six chestnut and four pea coal jigs alto-
gether. The water and everything smaller than buckwheat goes to the
double gyrating screen which makes Nos. 2 and 3 buckwheat and dirt,
and which is composed of two boxes, one above the other. Each box
of the screen is divided into three parts, making really six sets of screens
in the one machine. The round chestnut coal when it comes from the
four round chestnut coal jigs goes directly into the pockets. The round
stove coal goes over a set of automatic slate pickers where men and boys
take out the remaining slate. The flat chestnut and stove coal, after
coming out of the jigs, goes over another set of automatic slate pickers
which have a smaller slot than the upper ones and then passes to a set of