November 24, 1916.

THE COLLIERY GUARDIAN.

1003

mark

PLOWRIGHT BROS. LTD.,

Brampton Iron Works, Chesterfield.

Steam Heater Units

for

FACTORY HEATING.

Advantages of the Unit System :

Absence of air ducts, which obstruct the light, and in some
cases would interfere with the overhead gear in a shop.

Sirocco Heater Units only require steam and drain
connections and cables to the Electric Propeller. The
Units occupy very little floor space. The temperature can
be regulated at each Unit, consequently no steam is wasted
by overheating some portion of a building in the effort of
maintaining a desirable temperature in some other portion.
The warm air is delivered near the floor level where it is
most needed. Extensions to the Unit System are easily
carried out, and it will be found invaluable for supplementing
existing and insufficient Heating Plants. The Units can be
readily removed and installed in a new position when
necessary.

Send for Folder No. 3074C.

DAVIDSON & Co. Ltd.

SIROCCO

Engineering Works,

BELFAST.

Speciality-

COAL SCREENINGsCONVEYING

SECTION OF SCREENING PLANT AT BENTLEY COLLIERY, DONCASTER.











CONSIDERABLY OVER

100 PLANTS H

Estimates and Designs on application.

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

WORK IN
BRITAIN
COLONIES.

WALKER BROS. (Wigan)
LIMITED.
Codes: ABC 4th. & 5th, Lieber’s, Western Union, Moreing & Neal, Mining.

...

t

j

■ J

I

I



AIR COMPRESSORS

with light Disc Valves to recent
Patents now at work (or on order)
indicating over

135,000 raising total output to 500,000 H.P.

PATENT UNLOADING DEVICE AND OUTPUT
REGULATOR, FOR POWER DRIVEN PLANTS.

Ventilating, Winding and
General Mining Machinery.

Pagefield Ironworks, WIGAN.

Telegraphic Address: “ Pagefield, Wigan.”	Telephone: No. 14 Wigan (2 lines).

PATENT

“MAC” VALVE.

■ flu

A

a

Figure 8200— Inside Sci?ew
Figure 8205-0utside Scx«ew

Suitable for the
Highest Steam Pressures.

Fitted with
Hopkinson’s ‘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and valve are withdrawn,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 SOO tons 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 & G” L" Huddersfield,

Makers 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 & Petrograd.

No. 374.------------	----