January 12, 1917.

THE COLLIERY GUARDIAN.

65

Simplex Conduits, Limited,
GARRISON LANE, BIRMINGHAM.

113-117, Charing Cross Road, London, W.C. 6, White Horse Street, Leeds.

16, Corporation Street, Manchester.	96, Whitechapel, Liverpool.

72a, Waterloo Street, Glasgow.	14, Heathfield Street, Swansea.

61-65, High Bridge, Newcastle.	4, Westgate Street, Cardiff.

10 & 11, Denmark Street, Bristol.	1, Crimon Place, Aberdeen.

PLOWRIGHT BROS. LTD.,

Brampton Iron Works, Chesterfield.

Speciality—

COAL SCREENING s CONVEYING

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SECTION OF SCREENING PLANT AT BENTLEY COLLIERY, DONCASTER.









CONSIDERABLY OVER

inn pi amt?

IUU i LbbIW I o amd THE colomies-

Estimates and Designs on application.

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

MECHANICAL ENGINEERING OF COLLIERIES. T,c.peters.

Vol. I., Price a is. net (By post 21s. 8dJ.	Vol. II., Price ios. 6d. net (By post 11s.). 1

SUPPLEMENTARY VOL.—Price ios. 6d. net (By post 11s.).

THU COLLIERY GUARDIAN CO. LTD., 30 & 31, Fumival Street, Holborn, London, E.C.

6% TO B% SAVING IN FUEL, or 12% TO 15% MORE STEAM



SINGLE HOOD

Circulator

39,Victoria Street, London, S. W.

Stanley’s Plain Hedley Dial

Universally acknowledged to be
the very best in design, material,
workmanship and finish. Our
Instruments are as perfect as
it is possible to make them.

Please send for our “ K.12 ” Catalogue,
and compare our prices with those of other
first-class makers.

“■ ST A N L EY-

The Largest Manufacturers of
SURVEYING and DRAWING
INSTRUMENTS in the World.

W. F. STANLEY & CO. LTD.,

286, HIGH HOLBORN, LONDON, W.C.

HOPKINSON-FERRANTI

PATENT

STOP VALVE

For Steam and High Pressure Water Service.

The Greatest Advance in Valve Construction of the Tinies.

PRINCIPLE;

Converting the pressure of
the fluid into velocity and re-
converting the velocity into
pressure, thereby passing an
amount of steam equal to full
carrying capacity of pipe.

SELLING POINTS:

Passes same quantity of steam as a full-
bore valve.

Seats half diameter of ordinary sluice
valve, therefore halves possible leakage.

Graded opening—no sudden rush of steam
in opening.

Is riot subject to wedging action or
mechanical strain.

When the valve is open the seats are pro-
tected from the flowing fluid by the eyepiece.

Always easy to open and close under
pressure.

Discs and Seats of

HOPKINSON’S

“PLAfNAM” METAL.

Suitable with Superheated Steam.



Illustrated Specifications and
Catalogue free on application.

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J. HOPKINSON & Co. Ld.,

Makers of Patent Valves arid Patent Safety Boiler Mountings,
HUDDERSFIELD.

London, Glasgow, Edinburgh, Cardiff, Oldham, Paris & Petrograd.

No. 374.	.