August 4, 1916.

THE COLLIERY GUARDIAN.

239

Koppers’ Coke Oven

Is undoubtedly the most successful Bye-Product Oven on the market.

.	Since its introduction a little over 10 years ago there have been built

12,500 KOPPERS’ OVENS.

KOPPERS’ OVENS ARE AT WORK HEATED BY
PRODUCER GAS AND BLAST FURNACE GAS.

KOPPERS’ DIRECT RECOVERY PROCESS

IS THE SIMPLEST ANO MOST EFFICIENT
SYSTEM OF AMMONIA RECOVERY.

PLANTS ERECTED FOR THE RECOVERY OF
BENZOL & TOLUOL, FOR TAR DISTILLATION &
THE MANUFACTURE OF SULPHURIC ACID.

-------— Full particulars on application to -

The Keppers' Coke Oven and Bye-Product Co.

301, GLOSSOP ROAD, SHEFFIELD. -XStmfSXZ-

Walter Scott Ltd.

Leeds

LEEDS STEEL WORKS,

England.



MANUFACTURERS OF

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

6 in. x 421b. R.S. Joists carved for Framework to Roadway.

Example of 10 in.

Pit Head Frame.

Erected in Works

for inspection.

♦

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.

WALKER RROS. (Wigan)

LIMITED.

Codes: ABC 4th & 5th, Lieber’s, Western Union, Moreing & Neal, Mining.





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).