June 29, 1917.

THE COLLIERY GUARDIAN.

1235

A high return on outlay assured
with coal at present abnormal
price.

Initial cost of Economiser repaid
in many instances in two to three
years.

A reduction in the coal account
means an increase in dividend.

Steaming capacity of boilers in-
creased.

SAVES ONE WAGON

OF COAL

IN EVERY FIVE.

ECSN0MI8ER_ (

Reduces the coal consumption
15 to 20 per cent.

Every ton of coal saved by the
Economiser at a colliery is another
ton for sale at market price.

Coal saving commences imme-
diately Economiser is connected
up. .

Write for Pamphlet “B.Q.” to:

E. GREEN t SON L"

Economiser Works, WAKEFIELD.

Steel Underframe

Railway Car-
riages, Tramcars,
and Wagons of
every description
for Hire and Sale
by Immediate or
Deferred Pay-
ments. Ironwork,
Wheels and Axles.

WAGONS.

Also Wagons with Oak Underframes

Makers of HYDRAULIC PRESSED BOSS
and other WHEELS and AXLES.

PRESSED S'T’EIEZIL. BOGIES.

Wagons for
Hire, capable of
carrying Six,
Elg-ht and Ten
Tons, part of
which are con-
structed specially
for Shipping- pur-
poses. Wagons
in Working Order
maintained by
Contract.

SECOND-HAND BALLAST WAGONS FIT FOR MAIN LINE TRAFFIC.

Sole Manufacturers of Dean & Churchward’s “ EITHERSIDE

BRAKE,” and Marillier’s Patent “ INSTANTER COUPLING.”

The Birmingham Railway
Carriage & Wagon Co. Ltd.,
WORKS : SMETHWICK, BIRMINGHAM.

Telegrams—“Carriage, Smethwick.”	Telephone—No. 296 Smethwick (Hines).

MECHANICAL ENGINEERING OF COLLIERIES. t. c. futers.

Vol. I., Price 3is. net (By post 21b. 84.).	Vol. II., Price 10s. 6d. net (By post Us.).

SUPPLEMENTARY VOL.—Price los. 64. net (By post 11b.).

THE COLLIERY GUARDIAN CO. LTD., 30 & 31, Furaival Street, Holborn, London, E.C. 4

Patent No. 7638. and Patents No.. 7241 and
17607 applied for.

12

RAISE)

LOWER

9\
k 8

•5A—.

Z4

5 J

RAISED®
^STOP/W

I

WINDING
SIGNALS
“ NON-CUMULATIVE.”

DAVIS’S Self-Contained

SOLENOID BELL

with DIAL INDICATOR.

Simple, Efficient, Inexpensive.
SEND FOR LIST 41V.

JOHN DAVIS & SON
(DERBY) LTD.,
All Saints Works, DERBY;

& 17, Victoria St., Westminster, London, S.W. 1
Phone—240 Derby. Telegrams—“ Davis, Derby.”

Winding Engines fitted with
Ferodo-lined Brakes

possess a 50 °/o greater margin of safety and can be worked at higher speeds than those
fitted with the old makeshift materials such as wood, leather and hemp.

These relics of an inefficient age have all the shortcomings common to makeshifts. They
are adversely affected by pressure, speed and heat, charring or failing through changing
conditions and requiring constant refitting owing to their short life.

Ferodo fabric was designed simply and solely to serve as a friction surface. Years of
experience were concentrated on producing a material not only to supersede the makeshifts
by eliminating their drawbacks, but to give a higher co-efficient of friction which would
enable engineers to raise their standard of production.



FRICTION SURFACES.

Contractors to the War Office and Admiralty, London General Omnibus
Co., & Underground Electric Railways of London & Paris. List H. from

THE HERBERT FROOD COMPANY LTD.,

Works - CHAPEL-EN-LE-FRITH.

Depots at LONDON, BIRMINGHAM, BELFAST, BRISTOL, CARDIFF, EDINBURGH, GLASGOW, LIVERPOOL, MANCHESTER & NEWCASTLE.
Agents for India: THE ASBESTOS & BELTING CO., 3 & 4, Waterloo Street, CALCUTTA.

V C2