January 19, 191'.'.

THE COLLIERY GUARDIAN.

119

■ • • TRAD E ■ • •

• • -.MARK • •

PLOWRIGHT BROS. LTD.,

Brampton Iron Works, Chesterfield.



Steam Heater Units
for
FACTORY HEATING.

some
shop,
drain

The

Advantages of the Unit System :

Absence of air ducts, which obstruct the light, and in
cases would interfere with the overhead gear in a

Sirocco Heater Units only require steam and
connections and cables to the Electric Propeller.

Units occupy very little floor space. The temperature can
be regulated at each Unit, consequently no steam is wasted
by overheating some portion of a building in the effort of
maintaining a desirable temperature in some other portion-
The warm air is delivered near the floor level where it is
most needed. Extensions to the Unit System are easily
carried out, and it will be found invaluable for supplementing
existing and insufficient Heating Plants. The Units can be
readily removed and installed in a new position when
necessary.

Send for Folder No. 3074C.

DAVIDSON & Co. Ltd

SIROCCO

Engineering Works,

BELFAST.

Speciality

COAL SCREENING s CONVEYING

* A J
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Illi

SECTION OF SCREENING PLANT AT BENTLEY COLLIERY, DONCASTER.







CONSIDERABLY OVER

inn pi amt?

■HIM I o and the colon,es-

Estimates and Designs on application.

Agent for South Wales: A. LEIGHTON STEVENS, 15, Fields Road, Newport, Mon.

rERFECTA^^^W

SINGLE HOOD

Circulator 39, Victoria Street, London, S.W.

ANNALS OF COALMINING & THE COAL TRADE.

Br Post, 25s. M.	By ROBERT L. CALLOWAY.	Price 25s nei.

The Colliery Guardian Co. Ltd., 30 & 31, Furnival Street, Holborn, London, E.C

CEMENTATION and
CHEMICAL TREATMENT

YEARS of STUDY
and EXPERIENCE
HAVE BROUGHT
MY SYSTEM OF
CEMENTATION
TO PERFECTION.

TO COLLIERY PROPRIETORS.

Shafts sunk, tunnels driven, and
other mining constructions carried
out in difficult and very wet ground
by the best method. Success guar-
anteed.

18 shafts completed in England,
and 7 in progress.

Ferro-Concrete Lining a speciality.
Feeders of water in shafts or levels
effectually treated.

ALBERT FRANCOIS,

Telegrams—“ Francois, Doncaster,"	Telephone—4 08 Doncaster.

“RDS” Steam Trap I

PATENT	&

Suitable for any Pressure.

A large number of these traps have been in use for several years, and. our experience has been so
satisfactory that we have every confidence in recommending them to steam users. The workman
ship and material are of the highest quality, and it is altogether a far superior article to the many
cheap bucket traps now on the market.

SPECIAL FEATURES.

Simplicity. Reliable. Quick
in action. No Dribbling.

Strong Intermittent Water
Discharge. Quick Cut-off.

Will lift its water 2 feet for
every 1 lb. steam pressure.

Fitted with Valve and Seat of
HOPKINSON’S “ PLATNAM ”
METAL, which is five times
harder than bronze and ad-
mirably suitable for with-
standing the cutting action
of the water.

Description.

This steam trap is of the open float
type, and consists in its simplest form of
a Water Chamber A, Float with central
guide B, Valve O, Water Inlet Pipe,
and Water Discharge Pipe. The dis-
charge pipe forms the guide for the float.

The valve remains on its seat until the
float has sunk low enough to touch the
collar on valve; it then immediately
b gins to discharge.

The Gallery or Water Pocket F is an
important feature, as it tills with water
when the float is at rest; when the float
begins to rise from its lowest position,
the water thus collected flows through
the hole G into the body A, thus ensuring
a rapid elevation of the Float indepen-
dent of a small amount of water passing
into the trap. The valve is not rigidly
connected with the bucket, and it is
therefore held on to its seat until the
Float acts on the Valve. This device is,
therefore, most valuable under all con-
ditions of working, but more especially
when the volume of water entering the
trap is small. Its lifting effect on the
Float is indicated by the sharpness with
which the water discharge is cut off.

CAST IRON BODY AND LID,
HOPKINSON’S “PLATNAM” Metal Valve & Seat.

HOPKINSON’S PATENT SAFETY BOILER MOUNTINGS AND VALVES for High Pressure
Superheated Steam, High-class Exhaust and. Water Sluice Valves for Condensing Plants, &c.,
Automatic Exhaust Valves, Reducing Valves, Steam Traps, &c., &c.

J. HOPKINSON & CO. LD.,
HUDDERSFIELD.
No. 374.