August 20, 1915.

THE COLLIERY GUARDIAN.

403

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’ 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. ■SSs’sSbSww-

Demy Octavo, 176 pages, Cloth.	Price 6s. 3d.

45 Original Photographs and Diagrams. (post free).

Miners’ Nystagmus:

Its Causes and Prevention,
By T. LISTER LLEWELLYN, ID., B.S. (Lond.), Ac.

WITH A PREFACE BY

Professor J. S. HALDANE, F.R.S., M.D.,
AND A LEGAL APPENDIX BY
DOUGLAS KNOCKER, M.B., Barrister-at-Law.

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ANNALS OF COALMINING & THE COAL TRADE.

BY ROBERT L. GALLOWAY.	Price a... net.

The Colliebt Guabdian Co. Ltd., 30 & 31, Furmval-st., Holborn, London, E.C.

To Colliery Proprietors,
IMPORTANT Engineers and

...	Contractors, &c.

To secure dependable winding and absolute
safety, all gear brakes should be fitted with
Cresswells* “CHEKKO” Semi-metallic Asbestos
Brake or Clutch Linings.

Their grip is firm as a rock, yet responsive
and pliant as a hand grasp. “ CHEKKO provides
instant and perfect retardation at all speeds and
under all loads. “ CHEKKO ” is a great precaution
against overwinding.

We make no brakes of cotton fabrics or other
than of pure Asbestos.

“ CHEKKO *’ Brake Linings easily outlast
many times all others, and are, therefore, not only
the best in quality, but also far the cheapest.

FOUNDED 1895.

THE

QUARRY

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Lime, Clay and
Cement Trades,

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Write for Samples, Diagrams and Prices, to :

CRESSWELLS’ Limited,
Asbestos Spinners & Manufacturers,
Wellington Mills, BRADFORD (Yorks).

Telegrams: “ Asbestos, Bradford.” Phone: 950 Bradford.