THE COLLIERY GUARDIAN.

January 3, 1913.

THE

Duplex

IMPORTANT NEW DEVELOPMENT IN GAS

ENGINE DESIGN

THE ‘-DUPLEX" VALVELESS GAS ENGINE.

The simplest and therefore the most reliable Engine on the market.

(Patent)

Valveless Gas Engine

NO

NO

NO

NO

NO

NO

ADMISSION VALVES.

EXHAUST VALVES.

CAMS.

SIDE SHAFTS.

VALVE POCKETS.

INTRICATE CASTINGS.

Easy to Lubricate. Easy to Overhaul. Steady Running.

The “ Duplex ” represents the highest standard of Gas Engine Construction.

In Single Units from 200 H.P. up to 4,000 H.P. or larger if required.

Write for Booklet.

daflicrxPlatt,E

MANCHESTER and LONDON.

■

■i

WELDED TUBES
up to 36 in. diameter, for
------------- MINING, GAS AND WATER. ----------------------—
EDWIN DEWIS & SONS, WOLVERHAMPTON.

Telegrams—“Lewis, Wolverhampton.”	London Address—143, Cannon Street, E.C.

Telephone—No. 15 Wolverhampton,	Liverpool Warehouse—58, South John Street.

NO MORE PIT CAGE ACCIDENTS I

Ascending
and
Descending
Gages
Safeguarded,

No
Interference
with
Winding.

Starting
in the
Wrong
Direction
Prevented.

# •





Safety
assured
with

‘THE
VISOR.

The most

Effective

Machine on
the
Market.

160

at work.

ZXX...JOHN WOOD & SONS Ltd.

Telephone : 55 Wigan.

Engineers, 'WTGrAIM

Telegrams: "Haulagm, Wig in.”