December 11, 1914.

THE COLLIEHY GUARDIAN.

U43

Cloth, Price is. 6d. net.
SUGGESTED RULES

FOR

RECOVERING COAL MINES AFTER
EXPLOSIONS AND FIRES.

By W. E. GARFORTH.

THE COLLIERY GUARDIAN CO. LTD.,

30 & 31, Furnival Street, Holborn, London, B.C.

Mining BOOKS

At Tremendous .deductions ! 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.

______________________________

The Gosforth Foundry Co. Ltd.

Malleable Ironfounders,
DRONFIELD, near SHEFFIELD.

Makers of all kinds of

DRIVING & ELEVATOR CHAINS,
SPROCKET WHEELS, ELEVATOR
BUCKETS, &c.

British Manufacture Best Quality at Lowest Prices
Every description either separate or in cases.
SPECIAL 12 tn. CARDBOARD PROTRACTOR,
reading to i°, at 2«. 6rt., postage 6d.

ILLUSTRATED CATALOGUE ON APPLICATION.

WU MARI IN ft Mathematical Drawing and Surveying
■ rli nMnuilVUj Instrument Manufacturer,

47, Finsbury Pavement, London, E.C.

Established 1851.	Factory—HACKNEY, E.

British Insulated & Helsby Cables Ld.,

ELECTRICAL CABLE MAKERS & ENGINEERS.

REGD. TRADE MARK.

Works: Prescot, Helsby, & Liverpool.

8EE LARGE ADVERTISEMENT EVERY FOURTH WEEK.

YEADONS’ Latest PATENTED

BRIQUETTE MACHINERY,

For Coal, Coke, Lignite, Iron and other Ores.

YEADON, SON & CO.,	LEEDS,

Have a World-wide Reputation,	They have supplied MORE BRIQUETTE PLANTS

and 38 Years’ Experience.	than any other firm in this country.

‘Clear Flow’ Bore .1111111111111111111111:1111111111111111111111111111114'

NO FRICTION

NO OBSTRUCTION.

Willcox’s

Elliptic Full-way Cock
possesses all the advantages of a round-way full-bore cock without the added cost. By its special construction the bore
gradually tapers from a circular inlet to an ellipse in the centre, and thence to circular outlet ; consequently there
is no more friction at the valve than in straight run of pipe. IT RETAINS AN EQUAL AREA RIGHT THROUGH.

Diagram of passage in old
style elongated-way cock
with objectionable obstruc-
tions. Note the uneven
flow lines and back eddies,
with consequent restricted
flow, creating friction.

Diagram illustrating
unobstructed passage
in the “Elliptic” Cock.
Note the even flow
lines—no back eddies,
therefore elimination
of frictional resistance.

Write
TO-DAY
for detailed
particulars
and
prices.

W. H. WILLCOX & CO. LTD., 32 to 38, Southwark Street, London, S.E,

^1lllllllllllllili|l|iliiiHII!|i|i!ll|li|lll!llllll||l||||||||!lllllllllllllllllllllllllllllllllllllllllllllllllllllll!lllllllllllllllllllllllllllllllllllllllllllllll||lllllll||llllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllll?

Semet-Solvay Coke Ovens

SECTION OF OVEN

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.

SHOWING SOLID CONSTRUCTION.

THE COKE OVEN CONSTRUCTION CO. L!

Howard Chambers, 155, Norfolk Street, SHEFFIELD.