December 18. 1914.

THE COLLIERY GUARDIAN

1265

Walter Scon Ltd.

Leeds,	LEEDS STEEL WORKS,	England.

MANUFACTURERS OF

BRITISH STANDARD ROLLED STEEL JOISTS, CHANNELS,
TRAMRAILS AND PERMANENT WAY RAILS, Ac.

w

ft

ift ft ftift ft ft

Pit Head Frame.

Erected in Works
for inspection.

SECTION OF SCREENING PLANT AT BENTLEY COLLIERY, DONCASTER.

Example of 10 in. x 6 in. 42 lb. R.S. Joists curved for Framework to Roadway.



ROLLED STEEL JOISTS for PIT PROPS,
FRAMEWORK TO ROADWAYS. &c.

STRUCTURAL STEELWORK FOR BUILDINGS, &c.

Mild Steel Blooms, Billets, Slabs, Tinbars, Rounds & Flats.

Rolls cut for Special Sections and to approved quantities.

Books of Sections and other information on application.

PLOWRIGHT BROS. LTD.,

Brampton Iron Works, Chesterfield.

Speciality

COAL SCREENING & CONVEYING



CONSIDERABLY OVER

100 PLANTS h

Estimates and Designs on application.

Agent for South Wales: A. LEIGHTON STEVENS, 16, Fields Road, Newport, Mon.

WORK IN
BRITAIN
COLONIES.

«**

The

Gosforth

Foundry

Co. Ltd.,

Malleable
Ironfounders,

Dronfleld,

near

Sheffield.

Makers of all kinds of Driving and Elevator
Chains, Sprocket Wheels, Elevator Buckets, &c.

OPKINSON

PATENT

“MAC” VALVE.

HU

Wbf

!£■

3

3

Figure 8200—Inside

Figure 8205—Outside Scx?e-w

Suitable for the
Highest Steam Pressures.

Fitted with

Hopkinson’sA Platnam ”

Metal Renewable Valve
and Seat.



All parts interchangeable.

All joints made by metallic
contact, thereby obviating the
necessity of using jointing
material.

By removing the cover the seat
and valve are withdrawn,
enabling new parts to be in-
serted in about a minute’s
time, and without the neces-
sity—as with ordinary valves
—of removing the valve body
from its fixed position.

The Renewable Valve and Seat is made of

Hopkinson’s “Platnam” Metal

which is suitable for superheated steam and bad waters.

There are many valves with renewable valve and seat upon the market, but under modern
conditions and high pressures do not last any length of time owing to the deterioration which
takes place on the valve and seat, and consequently the renewing of the p-rts is a frequent
occurrence. We have tried our “Platnam” Metal under severe conditions, and have every
confidence in recommending it to work under high temperatures. The “ MAC ” valve has
been designed to adopt this metal for the reuewable valve and seat.

Upwards of SOO tong of Standard Steel Castings kept in stock.
We can give immediate delivery of iron and steel Valves.

Illustrated Catalogue Post Free on Application.

J. HOPKINSON & C° L° Huddersfield,

Jfafcer* of 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.

Depots & Showrooms —London, Glasgow, Edinburgh, Cardiff,
Oldham, Blackpool, Paris & St. Petersburg.

No. 306.