May 11, 1917.

THE COLLIERY GUARDIAN.

893

• •• TRADE • • •

• • MARK • •

PLOWRIGHT BROS. LTD.,

Brampton Iron Works, Chesterfield.

AIR

WASHER

■J



For Cooling Turbo-Generators and
supplying clean air to Compressors.

Thorough Washing.

The air current is brought into intimate contact with
a very fine mist, and all particles of foreign matter
are removed either in the spray chamber or by means
of the scrubber plates.

Elimination of Free Moisture.

A series of carefully - designed eliminator plates
removes all free moisture from the air current, which
passes out of the Washer in a cool and pure state.

Economy in Water.

The water is recirculated, passing on its way to the
spray nozzles through two sets of Filters.

Write for Publication No. 1013 C.

DAVIDSON & Co. Ltd., Sirocco Works, BELFAST.

TO B% SAVING IN FUEL, or 1 2^ TO 1 5% MORE STEAM

Perfects

SINGLE HOOD

Circulator 39, Victoria Street, London, S. W. 1

ANNALS OF COALMINING & THE COAL TRADE.

By Post, 25s. M.	By ROBERT L. CALLOWAY.	Price ass. net.

The Colliery Guardian Co. Ltd., 30 & 31, Furnival Street, Holbom, London, E.C. 4

FUEL OIL

for industrial furnaces, Diesel engines & merchant ships.

We supply a clean,
high-grade fuel oil.

Brotherton & Co. Ltd

WORKS—

Birmingham
Glasgow
Leeds
Liverpool

City Chambers,

Leeds

WORKS-

Middlesbrough
Sunderland
Wakefield
Workington

Speciality-

COAL SCREENING»CONVEYING

A

V

int SI

SECTION OF SCREENING jPLANT AT;-BENTLEY COLLIERY, DONCASTER.

CONSIDERABLY OVER

inn pi amt? -A-Z.V

IUO IT LHIv I w and THE colonies-

Estimates and Designs on application

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

“RDS” Steam Trap

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.

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

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 centra]
guide B, Valve C, 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
begins to discharge.

The Gallery or Water Pocket F is an
important feature, as it fills 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 or 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.

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 & GO. LD.,

HUDDERSFIELD.