January 21, 1916.

THE COLLIERY GUARDIAN.

107

THE

FURNACE.

This furnace burns any class of fuel,
large or small, and it burns with special
advantage poor-quality and refuse fuels
such as pond settlings, coal pickings, large
lumps and small, coke-dust, shale or
material which contains a large percentage
of ash or clinker. With such refuse it is
able to generate steam as quickly as
furnaces fitted with stationary bars, burning
a higher-grade coal. The furnace consists
of a strong cast-iron front, lined with
firebrick, and fitted with a door of ample
size for hand-firing. The fire-bars are of
the Bennis self-cleaning trough type; the
tubular fire troughs run the whole length of
the grate. The tubular bars are protected
from direct contact with the fire by being
covered with short inter-locking grate bars
about 2 ft. in length. Any one of these can
be replaced without interference with, the
rest of the fire surface.

Each trough is provided with an inde-
pendent steam jet blower, and fitted with
grids having graduated air spaces.

BENNIS PATENT SELF-CLEANING COMPRESSED AIR

ARRANGED FOR HAND-FIRING.

The air spaces between the bars are
always free and open and each tubular fire
trough has its own supply of air, fed by a
minute steam jet, so that the draught is
evenly distributed over the whole fire-grate,
and the boiler continues to do its work even
while the operation of cleaning out the
clinker from the chamber proceeds. The
fire is thus always clean and ready for
sudden calls for increased steam. By
turning the blowers full on, the rate of
combustion can be enormously increased.

The bars are constructed with extremely
fine air spaces so that coke breeze
or dust fuel can be burned with
advantage.

A steel shaft, carrying a cam
for each bar, is placed beneath
the front to operate the bars, com-
pelling them to stir up the fire and
convey it slowly to the back of
the grate, where the clinker is
deposited in a pit arranged for its
reception. The cam shaft is

operated by strong gearing, supported by a
bracket fixed to the furnace front. A swing
door, connected by a chain to the front, is
situated beneath the back bearer, for facili-
tating the cleaning out of the ashes.

The arrangement which admits of the
furnace being hand-fired and of the removal
of ash without diminishing the output of
steam during the operation, renders this
furnace particularly suitable for collieries
and gas works desirous of utilising their pit
rubbish and coke breeze as fuel. Further
information will be gladly sent on application.

Ed

LITTLE HULTON......BOLTON

AND 28 VICTORIA STREET LONDON SX

“Spade” Washers

For the Scottish Tube Company’s Tubes,
and others.

JOHN E. KEIRBY & SONS LT°

SWINTON, near MANCHESTER.

Telegrams—“Keirby,” Swinton, Manchester. Established 1864.

(The word “SPADE” is a Registered Trade Mark.)

Cloth, Price is. 8d. post free.

SUGGESTED RUUEIS for

RECOVERING COAL MINES AFTER EXPLOSIONS & FIRES.

By W. E. QARFORTH.

THE COLLIERY GUARDIAN CO. LTD.,

30&31, Furnival Street, Holborn, T.ondon, E.O.

New Models Nine Sizes.

Patented 1902, 1906 and 1910.

Automatic Z3eta.cli.men*.

The 1911 lever has large lateral stops and a
wedge-shaped head.

Drop-forged shells (two sizes), levers (four
sizes), catches and couplings.



SMALLMAN patent HAULAGE CLIPS.

Illustrated Catalogue.	Clips can be had without catches.

Patentee and Sole Manufacturer:—

JAMES W. SMALLMAN, Nuneaton, England.

More Light means

Cleaner Coal, Less Roof
Accidents, and Freedom
from Nystagmus. . . .

= HAILWOOD’S =

Combustion Tube Lamp
is cheaper, more reliable,
and has greater candle
power than electric lamps.

ACKROYD & BEST Ltd.,

Morley, nr. Leeds.