October 30, 1914.

THE COLLIERY GUARDIAN.

917

PLOWRIGHT BROS. LTD.,

Brampton Iron Works, Chesterfield.

MINE FANS

Speciality

COAL SCREENING & CONVEYING

b

Deliver more air at less cost for power than
the ordinary paddle blade Fan. Sirocco Fans
can be arranged for reversal of air current.

DAVIDSON & Co. Ltd,

Sirocco Engineering Works,

BELFAST.

I '

im 8 *

I

III! ’•*.

II" ' .





SECTION OF SCREENING PLANT AT BENTLEY COLLIERY, DONCASTER.

CONSIDERABLY OVER

inn pi antq ~

■ UU I LHH I O and THE colon,e£

Estimates and Designs on application

Agent for South Wales: A. LEIGHTON STEYENS, 16, Fields Road, Newport, Mon

208 pages f’cap folio. Over a hundred illustrations and 60 plates (coloured).

PRICE 10s. (10s. 7d. post free).

RECORD OF

FIRST SERIES OF THE

BRITISH COAL DUST
EXPERIMENTS

CONDUCTED BY THE

COMMITTEE APPOINTED BY THE MINING ASSOCIATION OF
GREAT BRITAIN.

“RDS” Steam Trap

PATENT

Suitable for any Pressure.

A large number of these traps have been in use for several years, and our experience has been so
satisfactory that we have every confidence in recommending them to steam users. The workman-
ship and material are of the highest quality, and it is altogether a far superior article to the. many
cheap bucket traps now on the market.

A Record of the Experiments carried out during 1908 and
1909 at the Altofts Experiments Station.

CAST IRON BODY AND LID,
HOPKINSON'S “PLATNAM” Metal Valve & Seat.

SPECIAL FEATURES.

Simplicity. Reliable. Quick
in action. No Dribbling.

Strong Intermittent Water
Discharge. Quick Cut-off.

Will lift its water 2 feet for
every 1 lb. steam pressure.

Fitted with Valve and Seat of
HOPKINSON'S “PLATNAM”
METAL, which is five times
harder than bronze and ad-
mirably suitable for with-
standing the cutting action
of the water.

Description.

This steam trap is of the open float
type, and consists in its simplest form of
a Water Chamber A, Float with centra]
guide B, Valve C, Water Inlet Pipe,
and Water Discharge Pipe. The dis-
charge pipe forms the guide for the float.

The valve remains on its seat until the
float has sunk low enough to touch the
collar on valve; it then immediately
begins to discharge.

The Gallery or Water Pocket F is an
important feature, as it fills with water
when the float is at rest; when the float
begins to rise from its lowest position,
thp water thus collected flows through
the hole Q into the body A, thus ensuring
a rapid elevation of the Float indepen-
dent of a small amount of water passing
into the trap. The valve is not rigidly
connected with the bucket, and it is
therefore held on to its seat until the
Float acts on the Valve. This device is,
therefore, most valuable under all con-
ditions of working, but more especially
when the volume of water entering the
trap is small. Its lifting effect on the
Float is indicated by the sharpness with
which the water discharge is cut off.

HOPKINSON'S PATENT SAFETY BOILER MOUNTINGS AND VALVES for High Pressure
Superheated Steam, High-class Exhaust and Water Sluice Valves for Condensing Plants, &c.,
Automatic Exhaust Valves, Reducing Valves, Steam Traps, &c., &c.

Published by—

THE COLLIERY GUARDIAN COMPANY LTD ,

30 & 31, Furnival Street, Hnlborn, London, E.C.

J. HOPKINSON & CO. LD„

HUDDERSFIELD.

No. 275.