296

THE OOLLIEBY GUABDIAN.

August 7, 1914.

The most silent running of all Gas Engines.

1,000 B.H.P.

Vertical
Valveless
“ Duplex ”
Gas Engine.

.	’ ■■ r ‘	._______________i

These Engines are built to work on any class of gas, such as Producer,
Coke Oven, Blast Furnace, Town’s Gas, &c., and are arranged for
driving Electric Generators and Pumps, direct, or line shafting by rope
transmission.



THE keynote of the “ Duplex ” Valveless Gas Engine is simplicity. There 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

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 compact-
ness of design is of the utmost importance where space is a consideration. The minimum
weight, too, permits of inexpensive foundations. For driving to alternators, cotton-spinning
and other machines, where a steady turning movement is essential, the “ Duplex ” Valveless
Gas Engine is ideal.

Booklet 74 gives a full description of this	■ Bl

low-priced engine, which is made in all I ■ I I lg"| BBl11 TTD
sizes up to 4,000 h.p. On receipt of	JLCJJULlvJL UL Br HI Bl I a,

enquiry we will send you a copy.	MANCHESTER and LONDON.

Allen’s Stone Dust Making Plant

has many advantages over other types.

Write for full particulars /

Edgar Allen & Co. Limited,

Imperial Steel Works,
SHEFFIELD.

The “EXHALL "overwind preventer

(Jackson & Staley’s Patent).

Any Engineman can understand it after once seeing it in operation.

(1). Effectually prevents the Cage being dashed into the sump boards when men are being lowered.

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(2)	. The Engineman cannot start In the wrong direction.

(3)	. The Engineman cannot exceed any predetermined

speed in winding.

(4)	. Steam is shut off if winding at high speed continues

too near the end of wind.

(5)	. There are two independent mechanisms, either of

which shut off steam and apply the brakes to
prevent overwinding,

(6)	. After the action of the machine in preventing an over-

wind it can be set ready for re-use by one man, and

Winding can be Continued Within One Mlnnte.

Adopted by OVER 120 COLLIERIES,

amonff which are:—

The Lllleshall Co. Ltd.............. 8 machines.

The Weardale Steel, Coal & Coke Co. Ltd. ...	7 machines.

The New Hucknall Colliery Co. Ltd. . 6 machines.

&c
Bole 1MI akera-.

NORTONS (TIVIDALE) LTD.,

Hecla Works, Tipton, ENGLAND.