July 10, 1914

THE COLLIERY GUARDIAN.

101

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WALKER BROS. 2=

Pagefield Ironworks, WIGAN. LONDON Office : New Broad Street House.

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THE accumulated experience of forty years is at the disposal of every
Engineer or Mining man who brings his enquiries to us.

The knowledge acquired from a long and intimate association
with the Mining World has been brought to bear upon the design and
construction of all our products, and this in itself is a guarantee of satis-
faction to the user.

We manufacture Steam Engines of various types, Air and Gas Com-
pressing Engines, Blowing Engines, Ventilating Machinery—including the
well-known “ Indestructible ” Fans—Winding Engines, Haulage and General
Mining Machinery.

AIR COMPRESSING ENGINES.

HIGHER piston speeds in Air Compressing Plants is a present day development which calls for
something different from the hinged, poppet, or mechanically controlled type of valve. These give
good service when employed on engines running at moderate speeds, but where a rapid beat is demanded
may suffer in efficiency.

The NEW PATENT DISC VALVES

now fitted to all our Air Compressing and Blowing Engines have the minimum of inertia and there is an ample port
opening with an exceptionally low lift. Special grinding and tempering of the valves ensure fluid tightness, and they
endure for a prolonged period of active life when working in conjunction with our Patent Valve Guard of resilient form.

The Patent Disc Valves can be fitted to existing installations with much advantage, having been
supplied, or on order for engines indicating over 100,000 Horse Power during the past five years.

AIR Compressors driven by power other than
steam, should be supplied with

Walker’s Patent Unloading Device
which regulates the supply of air in accordance
with the demand.

JT provides that gradual variation of load which
is especially essential where electricity is the
motive power. The device is applicable to both
single and two-stage compressing engines.

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Pair Compound Corliss Steam Two-Stage Air Compressing Engines with Patent Disc Valves.