1188

THE COLLIERY GUARDIAN.

June 22, 1917.

SURVEYING INSTRUMENTS

Davis’s

Cranked

Dial.



Theodolites,

Levels,

Barometers,

etc.

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

r‘

IF YOU HAVE

Haulage and Winding Problems

CONSIDER

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

MO/SELESS

Fitted in REDUCTION GEAR BOXES.

They give High Efficiency and Long Life.

PLOTTING INSTRUMENTS

for Railways, Mining Engineering, and Field work.

Handbook C 3 Free on Request. --

SEND FOR LIST No. 41/1 A.

JOHN DAVIS & SON

“The Coventry” Chain Co. Ltd.,

Coventry, England.

(Derby) LTD.

ALL SAINTS WORKS, DERBY;

& 17, Victoria St., Westminster, London, S.W.

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

'THE COVENTRY"

NEWTON, CHAMBERS

' & Co. Ltd.,

THORNCLIFFE IRONWORKS, NEAR SHEFFIELD.

ESTABLISHED 1793.

TANKS in Cast Iron or Steel. GENERAL CASTINGS, CONSTRUCTIONAL STEELWORK.

CONTRACTORS to the ADMIRALTY, WAR OFFICE, and CROWN AGENTS for the COLONIES.

Telegrams—“ NEWTON, SHEFFIELD.”	Telephone No. 2200 Two Lines.

J. S. UNDERWOOD « C?

Cotton Mill Row, SHEFFIELD.
Telephone-

X 3573.

Telegrams—	/

METALLOID. /

ENQUIRIES /	A

Solicited.

/ \

SFL ,rOn’ X '

Steel and \

V Metal Merchants,

WRIGHT’S FORGE &
ENGINEERING CO. LTD.

THOMPSON & CO.,

-------------- V/IGAN, -------------

Iron Merchants, ifotal and Mineral Agents.

RAILS OF EVERY DESCRIPTION, WITH FITTINGS COMPLETE,

FOR COLLIERIES, CONTRACTORS, &c.

SOLE AGENTS LN THE DISTRICT FOR THE SALE OF

Wigan Coal & Iron Co.’s Siemens Steel Billets, Blooms, Bars, Angles, Rails, &c.

SPECIALITY: STEEL FOR WAGON COUPLINGS.

K.H. BASIC PIG IRON. Also Spiegeleisen, Ferro-Manganese & Silico Spiegel.

Explosives (®e,,®n,te’ Polarile> Dynobel Nos. 3 & 4, Monobel No. 1, Viking Powder Nos. 1 & 2;
Co. Ltd. (, also Detonators, Electric Detonator Fuses, and all Blasting Appliances.

H aggie Brothers Ld. Wire & Hemp Ropes.

POOLEY’S PATENT WEIGHING MACHINES.

Telegraphic Address—“SPIEGEL WIGAN.”	Telephone—30 WIGAN

fi fton

--- Sole Manufacturera.-------

NEPTUNE FORCE, a 57, BISHOPSCATE,
TIPTON.	« LONDON, E.C. 2.

X