June 6, 1913.

THE}'COLLIERY GUARDIAN.

1183

MARK

Mine Fans

For small or large volumes
and high or low pressures.

High Pressure Fans

For blowing Forge Fires,
:: Cupolas and Furnaces. ::

Centrifugal Fans

For auxiliary under-
ground ventilation.

PLOWRIGHT BROS. LTD.,
Brampton Iron Works, Chesterfield.

Speciality

COAL SCREENING & CONVEYING.

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SECTION OF SCREENING PLANT AT BENTLEY COLLIERY, DONCASTER.





DAVIDSON & CO. LTD.,

SIROCCO ENGINEERING WORKS,

BELFAST.

CONSIDERABLY OVER

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IUU I LHlW I U AND THE COLONIES

Estimates and Designs on application.

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

Brussels Exhibition ■. Grand Prix:”

Roubaix Exhibition, 1911: “Grand Prix.”

Walter Scott Ltd.

Leeds,	LEEDS STEEL WORKS.	England.

MANUFACTURERS OF

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

Example of 10 in. x 6 in. x 421b. R.S. Joists curved for Framework to Roadway,

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Pit Head Frame.

Erected in Works

for inspection.

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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.

H P P K1N SO N ’S

PATENT

“MAC” VALVE.

Figure 8200—Inside

Figure 8205—Outside Screw

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Suitable for the
Highest Steam Pressures.

Fitted with
flopkinson’s3 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and valve are withdrawn,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 parts 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 renewable valve and seat.

Upwards of 500 tons of Standard Steel Castings kept in stock.

JVe can give immediate delivery of iron and steel Valves.

Write for Illustrated Specifications and Catalogue No. 66o, 4th edition, post free.

J. HOPKINSON & C° L° Huddersfield,

Makers of Patent Safety Koiler 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,
No. 236. Oldham, Blackpool, Paris & St. Petersburg.