70

THE COLLIERY GUARDIAN.

July 10, 3914

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WIGAN

HAULAGE GEARS

STEAM, AIR OR ELECTRICALLY DRIVEN



EDWIN LEWIS & SONS,
WOLVERHAMPTON.

Telegrams—u Lewis, Wolverhampton
Telephone—No. 15 Wolverhampton.

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Patent Iron Tube Works, Monmore Green.
Britannia Tube Works, Ettingshall.

London Office—143, CANNON STREET, E.C.
Liverpool Warehouse 58, South John Street.

JO!NT

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TUBES

OF ANY SIZE

For Compressed Air, Water or
Steam,
or any description of
COLLIERY WORK.

Original Inventors of Loose Flanged Tubes.

Simplicity and Reliability.

PHE ‘‘Duplex” is the only vertical gas engine without valves to the
working cylinders ; the only prime-mover actuated by gas in which
every strode is a driving strode. Because of its efficient yet simple design, the

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patent

“Duplex”

Valveless Gas Engine

costs less for repairs than any internal-
combustion engine yet devised.

To all interested in the generation of power for industrial purposes we shall
be pleased to explain the many unique features of our “Duplex”—the
smallest and simplest gas engine per B.H.P. ever put on the market.

Write /or Booklet No. 74. ClafliersPlatt b

MANCHESTER and LONDON.