December 24, 1914.

THE COLLIERY GUARDIAN.

1343

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.

THE ISCA FOUNDRY COMPANY LTD,

RAILWAY PLANT & GENERAL ENGINEERS,
Switches, Crossings, Turntables, Vater Cranes, Girders, Bridges,
Roofs, Pipes, Pumps, Wagons, Tanks, Engines, Boilers, Cranes,
Works: NEWPORT, MON.

London Office : 16 & 17 Devonshire Sq. Bishopscate St., E.C.

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—

WOODITE CO., Mitcham Common, Surrey.

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

SPECIAL 12 in, CARDBOARD PROTRACTOR,
reading to 1°, at 2«. Gd,, postage Od,
ILLUSTRATED CATALOGUE ON APPLICATION.

W II MAPI IND Mathematical Drawing and Surveying
lt« Fl. riHIiUlIUj 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.

SEE LARGE ADVERTISEMENT EVERY FOURTH WEEK.

STEAM AND HYDRAULIC

PIPES & CONNECTIONS.

ROPE PULLEYS.

HEADGEAR PULLEYS with Steel Arms, Split or Solid.

WM. GREEN & CO- (ecclesfield) LTD.,

Engineers and Ironfounders,

Ecclesfield, near SHEFFIELD.

MACHINE OR GENERAL CASTINGS.

Light or Heavy.	Quick Despatch.

^Illlllllllllllllllllllllllllllllllllllllllllllllllll1 Clear Flow’ Bore illiliilllllllllllllill'llllllllllllllllllllllllllllllr

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.

■	? /J/'""		ii Illi
	1! Il	tin	
iiimniiiiiiiiiiitiiiui tibp link	IIM		Hill ngl

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

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

Write
TODAY
for detailed
particulars
and
prices.

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

Tlllllllllillllillllllllllllliil - lll||i|||l!llllllllllllll[|l!lllllllllllllllllllllllllllllllllllllllllllllllllllllll!llllllllllllllllllllllllllllllllllllllllllllllllllll|||||||||lllllllillllllllllllllllllllllllllllllllll||||||||||||||| 111111111111111



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.