914

THE COLLIERY GUARDIAN.

October 30, 1914.

SURVEYING INSTRUMENTS

“VALOR” Oil Cabinets.

Davis’s

Cranked

Dial.



Theodolites,
Levels,
Barometers,
etc.

Fitted with polished brass pumps,
japanned red or green, and lettered in
black letters with brands of oil as
may be desired, without extra charge.

USED BY ALL THE PRINCIPAL ELEC-
TRIC LIGHT STATIONS, ENGINEERING
WORKS, AND FACTORIES OF EVERY
DESCRIPTION.

The only perfect system of keeping all
kinds of oil for daily use.

CAPACITY.

Stock Sizes.

50 gallons

30 „

20	„

12 „

6	„

PRICES.

Including Crates.
49/- each.

RO WASTE. RO TmEARAOE.

RO SMELL,

DAVIS’S IMPROVED HEDLEY DIAL WITH CRANKED LIMB,
ENABLING SIGHTS TO BE TAKEN TO ANY DEGREE FROM
LEVEL TO 90 DEGS. UP OR DOWN.

Davis’s Surveying Instruments
are used in the majority of Mines in the
United Kingdom, the Colonies, and other
parts of the World.

PLOTTING INSTRUMENTS

for Railways, Mining Engineering, and Field work.

SEND FOR 1-41 ST Ro. 41/1 A.

JOHN DAVIS & SON

fnoidiul V TR ALL SAINTS WORKS, DERBY;

lUvlDy I > .U ■ ■ & 17< Victoria St., Westminster, London, S.W.

~	■	Telegrams—“ Davis, Derby.” Telephone—240 Derby

Delivered Free to any Railway Station in the United Kingdom.

ORIGINAL MAKERS OF PATENT OIL CABINETS.

Full Descriptive List will be sent on application to—

THE VALOR CO. LTD.,

“Where the ‘New Era’ Fire Extinguishers come from,”

Aston Crass, BIRMINGHAM.

INDISPENSABLE TO STUDENTS.

THE

Mechanical Engineering
of Collieries.

By T. CAMPBELL FUTERS, M.I.M.E.

ALBERT FROST sC?.
HOWARD STREET,
SHEFFIELD.

WIRE: “ALFRO,SHEFFIELD?
, ’PHONE*. .4366,CENTRAL.
CODE*. fl.B.C. 4-th E9,

DOG
SP/KES

TRAM
NR ILS

GALVANIZED
WIRE

EROSTS
WVTfcWV ,

GlOVES&GA\n«\H5

TMESPEC/RLIJNES'WEHRNDLE
QU/CKESTDELIVERY'GUARANTEED

OPINIONS OF THE PRESS.

“ The book is well written and copiously
illustrated, and reflects credit on author
and publisher.”—Daily Post.

“ The Volume deals with the subject in a
manner that convinces the reader of the
intimate knowledge of the author, and that
he is giving us the latest on the subject.
We can confidently recommend the first of
this series to all those interested and
connected with colliery work, and the
assurance that what follows will be equally
serviceable.”— Practical Engineer.

“ The items are treated with fulness of
detail. The whole is evidently the work of
one well-versed in the science and practice
of his subject.”—Gljsg^w Herald.

THIS IMPORTANT WORK CONSISTS OF:—

Vol. I.—Bound in Cloth. Price 21s. net.

Part I.—Boring, Sinking, Surface Arrangements, Headgears,
Shafts. 128 pp. Illustrated by 294 Diagrams and Illus-
trations.

Part II.—Winding.	169 pp. Illustrated by 337 Diagrams and

Illustrations.

Part Hi,—Heapsteads, Screening and Washing. 177 pp. Illus-
trated by 427 Diagrams and Illustrations.

Separate parts in Paper Covers, Price 5s. 8d. each net.

Vol. II.—Haulage, Pumping, Power and Coke Ovens, and a
Complete Index to Vols. L and II. 294 pp. Illustrated by 585
Diagrams and Illustrations.

Paper Covers, Price 8s. 6d. ; Bound in Cloth, 10s. 6d. net.

SUPPLEMENTARY VOL.—Ventilating Fans, Coal-Cutting and
Conveying Machinery, Ambulance and Rescue Appliances.
238 pp. Illustrated by 294 Diagrams and Illustrations.

Paper Covers. Price 8s. 6d ; Bound in Cloth, 10s. 6d. net.

Publishers : THE COLLIERY GUARDIAN CO. LTD.,
30 & 31, Furnival Street, Holborn, London, E.C.