February 23, 1917.

THE COLLIERY GUARDIAN.

377

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Simplex Conduits, Limited,

GARRISON LANE, BIRMINGHAM.

113-117, Charing Cross Road, London, W.C.

16, Corporation Street, Manchester.

72a, Waterloo Street, Glasgow.

61-65, High Bridge, Newcastle.

10 & 11, Denmark Street, Bristol.

6, White Horse Street, Leeds
96, Whitechapel, Liverpool.

14, Heathfield Street, Swansea.

4, Westgate Street, Cardiff.

1, Crimon Place, Aberdeen.

PLOWRIGHT BROS. LTD.,

Brampton Iron Works, Chesterfield.

Speciality—

COAL SCREENING i CONVEYING

■<; - A* :

SECTION OF SCREENING PLANT AT BENTLEY COLLIERY, DONCASTER.







CONSIDERABLY OVER

100 PLANTS

NOW AT WORK IN
GREAT BRITAIN
AND THE COLONIES.

Estimates and Designs on application.

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

6% TO 8% SAVING IN FUEL, or 1 2% TO 15% MORE STEAM

SINGLE HOOD

Circulator

39,Victoria Street, London, S.W.

7CHECKS \

AND

\ BRASS /
^LABELS Ji



PROTAN A Commercial form of TANNIC ACID
(Containing 48—50 °/o TANNIN).
For BOILERS.
BRITISH MANUFACTURE.

In conjunction with Soda Ash

Enables the Boiler User to compound the most efficient
----- SCALE REMOVER ------------
at only a fraction of the cost of Proprietary Compositions.

Composition can toe based on analysis of water.

Samples and further particulars from

CLEMONS, MARSHALL & CARBERT,

Branch of The Yorkshirs Dyeware and Chemical Co. Ltd., Leeds.

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.

“RDS” Steam Trap

PATENT
Suitable fox* any Pressure.

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

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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.

Descriptioii.

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 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
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 Q 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, Eeducing Valves, Steam Traps, &c., &c.

J. HOPKINSON & CO. ID.,

HUDDERSFIELD.

No. 374.