December 1, 1916.

THE COLLIERY GUARDIAN.

1053

PLOWRIGHT BROS. LTD.,

Brampton iron Works, Chesterfield.

One of the smallest, cheapest,
and most effective watertight
turn switches on the market.

Made in 5 and 10 amp. sizes
in brass and iron cases.

Will operate under water.

SIMPLEX CONDUITS Limited

GARRISON LANE, BIRMINGHAM.

Telegrams—

“ Economy, Birmingham.”

113-117, Charing Cross Rd., London, W.C.

16, Corporation Street, Manchester.

72a, Waterloo Street, Glasgow.

61, High Bridge, Newcastle.

11, Denmark Street, Bristol.

Telephone—

No* 535 (4 lines) Victoria, Birmingham.

96, Whitechapel, Liverpool.

6, White Horse St., Boar Lane, Leeds.

14, Heathfield Street, Swansea.

4, Westgate Street, Cardiff.

1, Crimon Place, Aberdeen.

G% TO &% SAVING IN FUEL, or 1 2% TO 1 5% MORE STEAM

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ANNALS OF COALMINING & THE COAL TRADE.

Bt Post, 25s. 9d.	BY ROBERT L. CALLOWAY.	Price aS». net.

The Colliery Guardian Co. Ltd., 30 & 31, Furnival Street, Holborn, London, E.C

Stanley’s Plain Hedley Dial.

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

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.

ST A N L E Y

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

W. F. STANLEY & CO. LTD.,

286, HIGH HOLBORN, LONDON, W.C.

Speciality

COAL SCREENING«CONVEYING

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SECTION OF SCREENING PLANT AT BENTLEY COLLIERY, DONCASTER.







CONSIDERABLY OVER

inn piantc -aVb“

IOO I iLsHiiii I O and the cqlonies-

Estimates and Designs on application.

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

HOPKINSON-FERRANTI

PATENT

STOP VALVE

For Steam and High Pressure Water Service.

The Greatest Advance in

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 not 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

“ PLATNAM ” METAL.

Suitable with Superheated Steam.

Illustrated Specifications and
Catalogue free on application.

Valve Construction of the Tinies.

J. HOPKINSON & Co. Ld.,

Makers of Patent Valves and Patent Safety Boiler Mountings,

HUDDERSFIELD.

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

No. 374.