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LTD., Brampton Iron Works, Chesterfield. Speciality COAL SCREENING«CONVEYING ■ SECTION OF SCREENING PLANT AT BENTLEY COLLIERY, DONCASTER. Simplex Conduits, Limited, GARRISON LANE, BIRMINGHAM. 113-117, Charing Cross Road, London, W.C. 16, Corporation Street, Manchester. 72a, Waterloo Bridge, Glasgow. 61-65, High Street, Newcastle. 10 & 11, Denmark Street, Bristol. 6, White Horse Street, Leeds. 96, Whitechapel, Liverpool. 14, Heathfield Street, Swansea. 4, Westgate Street, Cardiff. 1, Crimon Place, Aberdeen. CONSIDERABLY OVER, 100 PLANTS NOW AT WORK IN GREAT BRITAIN AND THE COLONIES. Estimates and Designs on application. Agent for South Wales: A. LEIGHTON STEVENS, 15, Fields Road, Newport, Mon. OPK1NSON G% TO 3% SAVING IN FUEL, or 1 2% TO 1 5% MORE STEAM CIRCULATOR 39, Victoria Street, London, S.W. V:-' KT f :'v? ’ ■ f: “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. S SPECIAL FEATURES. MECHANICAL ENGINEERING OF COLLIERIES. T.c. peters. Vol. I., Price 21s. net (By post 21s. 8d.l. Vol. II., Price 10s. 6d. net (By post Ils.). SUPPLEMENTARY VOL.—Price 10s. 6d. net (By post Ils.). THE COLLIERY GUARDIAN CO. LTD., 30 & 31, Furnival Street, Holborn, London, E.C. QUALITY in SWITCH GEAR. LIQUID SWITCH GEAR of HIGH- CLASS MAKE and GOOD DESIGN. WRITE No. 60 PRICES OU 1FUT1 HOPKIN SON CAST IRON BODY AND LID, HOPKINSON’S “PLATNAM” Metal Valve & Seat. 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 central 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 P 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, the water thus collected flows through the hole G 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 or 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. J. HOPKINSON & GO. LD., 1 J. H. HOLMES & CO., Newcastle-011-Tyne. HUDDERSFIELD. No. 374.