Pebkuxby 16, 1917.

THE COLLIERY GUARDIAN.

361

—— THE ------___

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

15,000 KOPPERS’ OYENS.

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

KOPPERS’ DIRECT RECOVERY PROCESS

IS THE SIMPLEST AND 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 Koppers’ Coke Oven and Bye-Product Co.,

301, GLOSSOP ROAD, SHEFFIELD.

SURVEYING INSTRUMENTS

GOODALL CLAYTON & Co. Ld.

Davis’s

Cranked

Dial.

Theodolites,
Levels,
Barometers,
etc.

DAVIS’S IMPROVED HEDLEY DIAL WITH CRANKED LIMB,
ENABLING SIGHTS TO BE TAKEN TO ANY DEGREE FROM
LEVEL TO 90 DEGS. UP OR DOWN.

Davis’s Surveying Instruments
are used in the majority of Mines in the
United Kingdom, the Colonies, and other
parts of the World.

PLOTTING INSTRUMENTS

for Railways, Mining Engineering, and Field work.

LEEDS.

Telegram. :—

“Vertical, Leed».”

Telephone:—1982, Leeds.

All



MAKERS AND ERECTORS OF

SCREENING PLANTS, PICKING BELTS, SCREENS,
PITHEAD GEARS.

SEND FOR LIST No. 411 A.

BUNKERS, ROOFS, STEEL STRUCTURAL WORK, &c.

JOHN DAVIS & SON

GAS RETORT INSTALLATIONS, CONVEYING PLANTS.

(Derby) LTD.,

ALL SAINTS WORKS, DERBY;

& 17, Victoria St., Westminster, London, S.W.

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

RepresentativesH. L. CHESTON, Clarendon House, Boston Spa, Yorks.

W. OGDEN DAYSON, 1, Mount Street. Swansea, for South Wales.