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Simplicity and Reliability

1372
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THE COLLIERY GUARDIAN.

Jlne 19, 1914.

TTHE keynote of the “ Duplex” Valveless Gas Engine is simplicity. There
1 are fewer working parts in this engine than in any other. There are no
valves; the pistons act 'as- their own inlet and exhaust valves. It is double
acting—every stroke is a driving stroke—and is the only engine built on
high speed steam engine lines. Forced lubrication is fitted to every working
part, and as all cams, tappets, gear wheels, &c., have been eliminated,
absolute silence is assured. With the

(Patent)

Duplex

Valveless Gas Engine

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1,000 B.H.P. Vertical Valveless “Duplex” Gas Engine.

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there are no intricate castings to crack under the high working temperatures;
no cast-on water jackets (the simple tube-like cylinders are enclosed in a
water-tank) ; no cams and no side-shafts. Power for power, the Duplex
is the smallest gas engine made. This compactness of design is of the utmost
importance where space is a consideration. The minimum weight, too,
permits of inexpensive foundations. For driving alternators, and colliery
and mining machinery the “ Duplex ” Valveless Gas Engine is ideal.

The extreme simplicity of the “ Duplex ’’—the elimination of valves, cams and gears—
means continuity

of operation with minimum attention ; in other words,
low maintenance charges.

reliability and

We shall be pleased to send our booklet No. 74 to any reader
interested in the economical generation of power for industrial
purposes and to place our Staff of Experts at the disposal of
all contemplating new works or extensions.

Telegraphic
Address:
“ Mather,
Manchester.”

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MANCHESTER and LONDON.

Telephone No.':
6,200 City
(6 lines).