1158

THE COLLIERY GUARDIAN.

June 6, 1913.

NEWTON, CHAMBERS

“ & Co. Ltd.,

THORNCL1FFE IRONWORKS, near SHEFFIELD.

ESTABLISHED 1793.

Telegrams-1' NEWTON, SHEFFIELD.” _____	Telephone-No. 2200 (Two Lines).

MANUFACTURERS OF

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PIPES & FITTINGS

For Qas, Water & Steam.

STRUCTURAL STEELWORK

Girders, Roofs, Bridges.

TANKS

In Iron or Steel.

HIGH-CLASS CASTINGS

For Machinery and Engine Cylinders.

WHEELS

BAR WEIGHTS

PUMPS

TRADE

STANLEY

Stanley’s Tunnelling Transit
Theodolite. Has a hollow axis
so as to allow sights to be taken
through the centre and head of
the stand down a vertical shaft.

The Largest Manufacturers of
Surveying and Drawing
Instruments in the World.

Drawing Office Stationery of
all kinds supplied on the most
favourable terms. A very
large Stock kept.

.S

Please send for our “ K. 12 ”
Catalogue (post free), and
compare our prices with those
of other First-Class Makers.

W. F. STANLEY & CO. LTD.,

Export Department:—

Great Turnstile, Holborn, London, W.C.

Head Office and Show Rooms: —

286, High Holborn, London, W.C.

Modern Mining Methods.

Efficiency is the keynote in most mines at the present
day. This means that production must be increased
to the maximum, and the cost of production be reduced
to the minimum.

To accomplish this many points about the plant will
have to be considered, not the least important of which
is that of power transmission. A form of drive which
offers unequalled advantages is that of





The three main types of chains used in collieries are
the Silent, Roller, and Block.

The Silent Chain is used chiefly for main Haulage
Drives, Pumps, &c. Its greatest advantages are a
constant efficiency of 98 per cent., which is maintained
until the drive is worn out, and a high ratio of reduction
combined with the high speed at which it can be run.

The Roller Chain is an extremely valuable type for
Colliery work and one which is being extensively used
for driving Tipplers, Screens, Picking Belts, Inspection
Belts, Scraper Conveyors, Washing Plants, &c., &c.

It is a highly efficient form of drive, and one in
which there can be no slip—an important consideration
for screening purposes.

Another great advantage of the roller chain is that
it saves space owing to chains being so much narrower
than belts, sprocket wheels being so much smaller than
belt pulleys, andshorter centre distances being practicable.

Block Chains are mainly used in adapted forms as
Creeper, Haulage, Elevator and Conveyor Chains,
and for one hundred and one other purposes to which
they can be adapted.

We are exhibiting at the Mining Machinery
Exhibition, and shall be pleased to see you at our
Stand No. 53, Row E, and explain to you fully the
advantages of Renold Chain Gearing.

HANS RENOLD LTD., MANCHESTER.