874

THE COLLIERY GUARDIAN.

April 17, 1914.

^Simplicity and Reliability.

PHE "‘Duplex” is the only vertical gas engine without valves to the
1 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

pi;-1

■I1

1J ::

I v
f - •

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i,

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.

ClaflmPlatt e

MANCHESTER and LONDON.

Write for Booklet No. 74.

STONE DUST IN COLLIERIES

What the Home Secretary says :

In a recent official communication the Home Secretary writes :—“ It will be necessary to embody the recom-
mendations in statutory regulations under the Coal Mines Act, but I would urge owners most strongly, without
waiting for the formal settlement of the regulations, to take the matter into immediate consideration.

“The Committee have not in the report recommended the adoption of stone dusting to the exclusion of
watering, but it is generally recognised that any system of watering which does not render inert the dust, not
only on the floor, but on the supports and sides, would not be equivalent to the system of stone dusting
recommended by the Committee.”

Write for full particulars of

Allen's Stone Dust Making Plant

and its many advantages over
other types of machines.

Edgar Allen & Co. Limited, Sheffield.

for safety lamps,

LAMPROOM FITTINGS,

Enamelled Notice Plates,

---------- APPLY -

PROTECTOR lflMp **“T1N0 CO LTD., ECCLES.

FIRE ENGINE MAKERS.

to H.M.

The King,

By Appoint
sent

MERRYWEATHERS’

Steel Figures.

NAT. TELEPHONE
N9II2I-

trade ArM'ARK.	f tfry	\ O T

Brocco Works O' Edward Street,

TELEGRAPHIC ADDRESS	r ccld V

BROCCO SHEFFIELD	C

—<• MANUFACTURERS OF •>-----------

Steelmarks,Letters,Burn Brands,Brass & Rubber Stamps^?

liggsgi SteelDiec,Brass Checks,Labels,Pattern Makers Letters

EMBOSSING PRESSES	«■ GENERAL ENGRAVERS

FORCOMPANYSEALS. EVERY DESCRIPTION OFJOINERS S.ENCINEERSTOOLS

COLLIERY cm NER8 MANUFACTURING BRICKS
SHOULD SUBSCRIBI TO

THE BRITISH CLAY-WORKER

The Organ of the Brick and Tile Trades.

Published Monthly. Subscription : 8s. per annum, post free.

Send for Specimen Copy to the Publisher,

THE BRITISH CLAY-IORKER, 48, ESSEX-ST., LONDON, W.C.

Write
for
I11U8

trated
Price
List. ♦!

Specialities: BATME S & SAW BENCHES.

First class at competitive prices.

ROWLAND C. FOOT & Co. 11. Queen Victoria St., London, E.0

Largest Makers of High-class

HOSE PIPES

in the World.

Dub-Sub Canvas for Fire Duty*
Admiralty Leather for Flushing.
Armoured Rubber for Mines.

Write for “ Hints on Hose,” and quotations.

MERRYWEATHER & SONS,
Fire Engine and Hose Works,
GREENWICH, LONDON, S.E.

THE SOUTH WALES COALFIELD. PART I!

By Henry K. Jordan, F.G.S. (Past President and first
Gold Medallist of the South Wales Institute of Engineers).

This Paper, which deals with the western part of the Coalfield, has jus:
been published by the South Wales Institute of Engineers. It consists of
81 pages of printed matter with Sections and Diagrams. The large drawing?
are issued separately and comprise

1.	A Horizontal Section across the anthracite region of Llandybie and

Pant-y-ffynnon, and via the Dulais Valley to the sea at Swansea. It
is drawn to a scale of six inches to one mile, is 8 ft. in length, mounted
on linen, and geologically coloured.	.	.

2.	Comparative Sections of the Lower Measures in the following areas —

(A)	Neath Valley.	(E) Ammanford.

(B)	Swansea Valley.	(F) Loughor Valley.

(C)	Brynamman District. (G) Gwendraeth District.

(D)	Amman Valley.	(H) Gwendraeth District.

These are drawn on one sheet, about 35 by 30in., mounted on linen, to
a scale of 200 ft. to 1 in.

3.	A Map of Swansea District, on a scale of 6 in. to one mile, showing

the outcrops of the coal seams.

A limited number of the above are for sale, and may be obtained from

The Secretary, The South Wales Institute of Engineers,
CARDIFF.

Price £1 Is., Postage Extra.

*• The South Wales Coalfield,” Part I., by Mr. H. K. Jordan, published
in 1908, price £2.2s., dealt with the eastern half of the Coalfield, and may bp
obtained from the Secretary.

Demy Octavo, 176 pages, Cloth.	Price 6s. 3d.

45 Original Photographs and Diagrams. (post free).

Miners’ Nystagmus:

Its Causes and Prevention,

By T. LISTER LLEWELLYN, M.D., B.S. (Lond.), &c.

WITH A PREFACE BY

Professor J. S. HALDANE, F.R.S., M.D.,
AND A LEGAL APPENDIX BY

DOUGLAS KNOCKER, M.B., Barrister-at-Law.

THE COLLIERY GUARDIAN COMPANY LTD.,
30 & 31, Furnival Street, Holborn, London, E.C.