968

THE COLLIERY GUARDIAN.

November 12, 1915.

JOHN WOOD & SONS, L™

Engineers, BARLEY BROOK FOUNDRY, WIGAN.

1OO-H.P. “ENDLESS”

Telephone—No. “ 55 ” Wigan.

Telegrams—“ Haulage, Wigan.”

and Improved
“ OUTSIDE-

BAND”
FRICTION
CLUTCH.

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Fitted with

AUTOMATIC BRAKE

Haulage Gears of every type.

WINDING, PUMPING & AIR COMPRESSING ENGINES.

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SURVEYING INSTRUMENTS

Davis’s

Cranked

Dial.

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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.

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 LIST No. 41/1 A.

JOHN DAVIS & SON

(Darby) LTD.,

ALL SAINTS WORKS, DERBY;

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