September 3, 1915.

THE COLLIERY GUARDIAN

465

THERE IS A

PLOWRIGHT BROS. LTD.,

Brampton Iron Works, Chesterfield.

CENTRIFUGAL FAN
for every purpose for which a
: : Fan can be used. :	:

Speciality—

COAL SCREENING • CONVEYING

A'

Fans for Dust Removal.

These Fans can deal with Dust of every
description.	Write for Bulletin No. 2009.

T S
)fr.’

SWgfF

.

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El

SECTION OF SCREENING PLANT AT BENTLEY COLLIERY, DONCASTER.









Davidson & Co. Ltd.,
Sirocco Engineering Works,
BELFAST.

CONSIDERABLY OVER

100 PLANTS

Estimates and Designs on application.

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

See RUUiE 15, par, i,

SPECIAL ELECTRICITY IN MINES RULES.

“ That Signalling Apparatus shall be so constructed and
worked that there shall be no open sparking.”



DAVIS-FRYAR

SIGNALS

For Haulage Planes, &c., in Gassy Mines.

PATENT No. 5919

B

Oil Contact Chamber.

Flexible
Pull-wire.

Flexible
Pull-wire.

D

This System is considerably cheaper than gas-proof pushes, and more efficient.

Arrangements can be made to see the System in operation in the mine.

SfSTMTJ FOR LIST Ttfo. 41 F.

JOHN DAVIS & SON

fOsrhiH 8 TH all saints works, derby;

S Owl Ulf I 1 aJ a ■ & 17, Victoria St., Westminster, London, S.W.

~	9 Telegrams—“ Davis, Derby.” Telephone—240 Derby.

PATENT

“MAC” VALVE.

’ .1S-L

■

8200—Inside Screw

Figure 8205— Outside Scx'e'w

Suitable for the
Highest Steam Pressures.

Fitted with
Hopkinson’st( 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and valve are withdrawn,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.

tr»warrf« of 500 ton* 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,

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 & St. Petersburg.

No. 306.________________________________________________________