November 27,1914.

THE COLLIERY GUARDIAN.

1143

Mining BOOKS

At Tremendous Eeductions ! 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. & Ct. FOYLE, 121-123, Charing
Cross Road, London, W.C.

THE ISCA

COMPANY LTD..

RAILWAY PLANT It GENERAL ENGINEERS,
Switches, Crossings, Turntables, Vater Cranes, Girders, Bridges
Roofs, Pipes, Pumps, Vagons, Tanks, Engines, Boilers, Cranes.

Works: NEWPORT, MON.

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

tWOODITEt

The best material for

Meal GAUGE GLASS RINGS

in all sizes and sections.

For Valves, Joint Kings, Pump

Cups, Kam Rings, Packing Rings.

Price List and full particulars on application io—

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 |°» at 2«. Gd„ postage Od.
ILLUSTRATED CATALOGUE ON APPLICATION.

W II IIARI IN 12 Mathematical Drawing and Surveying

WV. n. nMnLIHUj 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.y

Engineers and Ironfounders,

Ecclesfield, near SHEFFIELD.

MACHINE OR GENERAL CASTINGS.

Light or Heavy.	Quick Despatch.

^iiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiihiiiiiiiiiiii1 Clear Flow’ Bore lllllllllllllllillllllllllllllllllllllllllllllllllll l^‘

U

NO FRICTION

illcoxs

NO OBSTRUCTION.

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 '	.JE—:

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
TODAY
for detailed
particulars
and
prices.

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

HIIIIIIHHIIU!llllhl|||||llll!!Pll'l!|l!ililllll!llllllll!lllllllllllllllllllllllllllllllllllllllllllllllllllllll!llllllllllllllllllllllllllllllllllllllllllllllinill||l!lllllllllllhlllllllllllllllllllllllllllllllllllllllllllllllllllll 11111111111 f,

Semet-Solvay Coke Ovens

SECTION OF OYEN

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.