January 4, 1918.

THE COLLIERY GUARDIAN.

13

PLOWRIGHT BROS. LTD.,

Brampton Iron Works, Chesterfield.

Speciality-

COAL SCREENING & CONVEYING

MARK

The Mastery of the Air.

are always successful
in the struggle for
------ the ______
Mastery of the Air.

SEND US YOUR ENQUIRIES FOR :

Ventilation of Ships, Buildings and Mines,
Induced Draught on Boilers, Dust Removal,
High Pressure Fans for Forge Fires & Cupolas,
Air Washers for Cooling and Purifying the Air,
Fans for Removing Fumes or Steam,
Steam Heater Units for Heating Factories.

DAVIDSON & CO. LTD.,

Sirocco Works,

BELFAST.

llliiii
Is!

SECTION OF SCREENING PLANT AT BENTLEY COLLIERY, DONCASTER.







CONSIDERABLY OVER

100 PLANTS



NOW AT WORK IN
GREAT BRITAIN
AND THE COLONIES.

Estimates and Designs on application

HIGH SPEED STEEL

FAMOUS

BRANDS

UNIFORM QUALITY FOR CUTTING ALL CLASSES
OF METALS AT HIGHEST SPEEDS.

High
Speed Steel

Twist Drills,
Milling Cutters,
, Broaches & Hobs,

Hand Screwing Apparatus
(Stock, Dies, Taps,

Chasers, etc.),

Gauges,

Measuring

Machines.

Sir W. G. ARMSTRONG, WHITWORTH & CO. LTD.,

Telephone No.:	F* C U MW Mt 09 09 09 ht O	»	Telegraphic Address:

6480 Central (6 lines).	W W jf tWt it ft 90 ft	90 0 0 “Whitworth, Openshaw.”