888

THE COLLIERY GUARDIAN.

May 12, 1916.

WALKER BROS. (Wigan)

Codes :—A B C, 4th and 5th, Liebers, Moreing and Neal Mining	Ltd.

Code, Al Universal Mining, Western Union.

ESTABLISHED 1866.

AIR COMPRESSORS

Ji

A pair of Corliss Compound Steam Two-Stage Air Com-
pressing Engines, with Valves to Walkers’ Latest Patents.

with Valves to recent
Patents now at work
(or on order) indicating
over

135,000-H.P.

Raising our total output
during 4 0 years to

500,000-1.H.P.

Patent Unloading

Device for Power-
driven Plants.

WINDING, HAULING & GENERAL
MINING MACHINERY.

VENTILATING FANS

LOWER

12

RAISE,

RAISE
^STOP.

Slower

.STEADILY.

—■

Z.4

5j|

9 \

WINDING
SIGNALS
“NON-CUMULATIVE.”

ELECTRIC.
MECHANO-ELECTRIC.

MECHANICAL.

SIMPLE.

EFFICIENT.
INEXPENSIVE.

The “DAVIS-MACDONALD” BALL-RACE
CONTACT-MAKING RELEASE

is the most efficient Release in connection with Visual Signals.

Signals cancelled immediately the engine starts, also stops.

Emergency Signals shewn during Winding.

of the Walker “ Inde-
structible ” type.

Capacity of Fans at
work or on order.

100,000,000

cubic feet per minute.

HIGH MECHANICAL

EFFICIENCY

whether driven by
steam or electricity.

A pair of Four-cylinder Triple Expansion Driving Engines, with
Corliss Valve Gear.

fl

PAGEFIELD IRONWORKS, WIGAN.

Telegraphic Address: “ Pagefield, Wigan.”

ENTIRELY

ENCLOSED

from dnsl, oil,
etc. (not shown
in the
illustration).

The contact-
making arms
are



SEND FOR LIST 41 v.

JOHN DAVIS & SON (Derby) Ltd.

All Saints Works, DERBY; & 17, Victoria Street, Westminster, S.W.

SECURITY

FOR MEN AND PROPERTY

IN PIT SHAFTS.

No Wear on Guides.

Always kept in working order
by Self-action.

RECENT PIT ACCIDENT PROVED
NO DAMAGE.

TESTED BY TIME AND UNDER THE
WORST CONDITIONS.

B

A -

B

' -

f

A—Clip. B—Control Shaft. C—Clip Forks. D—Wedge.
E—Adjustable Connecting Bod. F—Self-acting Weight.
G—Automatic Sustaining Lever and Spring. J - Control
Gear. K—Control Chain. L—Cage Shoes. M—Guide Ropes.

PROVIDENCE PATENT SAFETY CLIP CO. LD„