August 6, 1915.

THE COLLIERY GUARDIAN.

293

________

Mining BOOKS

At Tremendous Reductions ! New Books at 25 per cent.
Discount! Books on Mining, Technical and all other Sub-
jects. Sent on Approval. State Wants. Send for Lists.
Books Purchased. W. & G. FOYLE, 121-123, Charing
Cross Road, London, W.C.

OXYGEN.

The BRITISH OXYGEN Co. Ld.

The oldest and most extensive Oxygen producing
and distributing business in the World.

Factories in all industrial Centres equipped
with modern plants producing Oxygen of
unrivalled quality for use with RESCUE
APPARATUS.

ADDRESSES OF THE COMPANY’S WORKS:

LONDON _____

BIRMINGHAM
WOLVERHAMPTON

Elverton St., Westminster, S.W.
Tunnel Avenue, East Greenwich,
Saltley Works.	[S.E.

Lower WAlsall Street.

CARDIFF _______ East Moors.

MANCHESTER____ Great Marlborough Street.

BIRKENHEAD____ Bromborough Port.

SHEFFIELD ____ Celtic Works, Savile Street.

NEWCASTLE-ON-

TYNE _______ Walker Gate.

GLASGOW_______ Rosehill Works, Polmadie.

SYDNEY _______ N.S.W.

WOODITE
The best material for
Conical GAUGE GLASS RINGS
in all sizes and sections

For Valves, Joint Rings, Pump
Cups, Ram Rings, Packing Rings,

Price List and full particulars on application to—

British Manufacture Best Quality at Lowest Prices
Every description either separate or in cases.

SPECIAL 12 in, CARDBOARD PROTRACTOR,
reading to 1°, at 2s. Oil., postage Rd,
ILLUSTRATED CATALOGUE ON APPLICATION.

WU U AD| |Nft Mathematical Drawing and Surveying

■ n. JlMIiUlliUy Instrument Manufacturer,

WOODITE CO., Mitcham Common, Surrey.

47, Finsbury Pavement, London, E.C.

Established 1851.	Factory—HACKNEY, E.

British Insulated & Helsby Cables Ld.,
ELECTRICAL CABLE MAKERS & ENGINEERS.

' MINING
AND
ELECTRICAL
MACHINERY
OF

REGD. TRADE MARK.

Works: Prescot, Helsby, & Liverpool.

SEE LARGE ADVERTISEMENT EVERY FOURTH WEEK.



IIIIHIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIilllllllllllllllllllllllllli^

Elliptic Full-way Cock
costs no more than an elongated-
way cock, and is equal in service
to a round-way full-bore cock.

AV. H. WILLCOX & CO. LTD., 32 to 38, Southwark Street, London.

CLEAR-FLOW
BORE.”

Write
TO-DAY
for detailed
particulars
and
prices.



__________________________

Semet-Solvay Coke Ovens

SECTION OF OVEN

SHOWING SOLID CONSTRUCTION.

Strongest in Design.
Separate sets of flues to each oven.
Very low Maintenance Cost.

________________________________________

“DIRECT” AMMONIA RECOVERY PLANT,
giving increased yield of Sulphate, with less
Labour, and a saving in Steam consumption.

THE COKE OVEN CONSTRUCTION CO. L!

Howard Chambers, 155, Norfolk Street, SHEFFIELD.