July 16, 1915.

THE COLLIERY GUARDIAN.

Ill

The Life of Steelwork is Doubled
When it is Coated with

BITUMASTIC™

“ BITUMASTIC ” Solution effectively Prevents Corrosion, and
thus saves Costly Repairs and Renewals.

“BITUMASTIC” is a Brilliant Black Colour, Supplied Ready
for Use.

Greater Covering Capacity and Superior Lasting Qualities
than Ordinary Paint.

WRITE FOR ILLUSTRATED PAMPHLET TO SOLE MANUFACTURERS—

WAILES DOVE BITUMASTIC LI?

And at London, Liverpool, Manchester, Glasgow, Cardiff, Birmingham, Leeds, &c.

’Phones in every office.	Telegrams—“ Bitumastic.”

QUALITY m SWITCH GEAR.

LIQUID
SWITCH
GEAR
of
HIGH-
CLASS
MAKE
and
GOOD
DESIGN.

WRITE
for
LIST

No. 60
with

PRICES
and
OUTPUTS

J. H. HOLMES & CO., Newcastle-on-Tyne.

PLOWRIGHT BROS. LTD.,

Brampton Iron Works, Chesterfield.

Speciality-

COAL SCREENING t CONVEYING

&

j jit







SECTION OF SCREENING PLANT AT BENTLEY COLLIERY, DONCASTER.

CONSIDERABLY OVER

inn piantq

mu i Lsoiw i v and ™e coL°N,Es

Estimates and Designs on application.

Agent for South Walts: A. LEIGHTON STEVENS, 15, Fields fted Newport, Mon.

The

Gosfortli

Foundry

Co. Ltd.,

Malleable
Ironfounders,

Dronfield,

near

Sheffield.

K

N

S

“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.

SPECIAL FEATURES.

HOPKIN SON

CAST IRON BODY AND LID,
HOPKINSON’S “PLATNAM” METAL VALVE & SEAT.



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
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 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.

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.

Makers of all kinds of Driving and Elevator

J. HOPKINSON & CO. LD.,

Chains, Sprocket Wheels, Elevator Buckets, &c.

HUDDERSFIELD.

No. 306.