May 23, 1913. THE COLLIERY GUARDIAN 1055 Walter Scott Ltd. Leeds, LEEDS STEEL WORKS. England. MANUFACTURERS OF BRITISH STANDARD ROLLED STEEL JOISTS, CHANNELS, TRAMRAILS AND PERMANENT WAY RAILS, &c. / * / <& i* J s •./ Pit Head Frame. . Erected in Works for inspection. \ i * V I L V' ® FS Example of 10 in. * 6 in. 421b. RS Joists curved for Framework to Roadway. ROLLED STEEL JOISTS for PIT PROPS, FRAMEWORK TO ROADWAYS, &c. STRUCTURAL STEELWORK FOR BUILDINGS, &c. Mild Steel Blooms, Billets, Slabs, Tinbars, Rounds & Flats. Rolls cut for Special Sections and to approved quantities. Books of Sections and other information on application. PLOWRIGHT BROS. LTD., Brampton Iron Works, Chesterfield. Speciality COAL SCREENING & CONVEYING. • J-• ’’’ f- SECTION OF SCREENING PLANT AT BENTLEY COLLIERY, DONCASTER. CONSIDERABLY OVER 100 PLANTS 3E WORK IN BRITAIN COLONIES. Estimates and Designs on application. Agent for South Wales: A. LEIGHTON STEVENS, 16, Fields Road, Newport, Mon. Power Saved is Money Gained. Renold Silent Chain Drive will save you power. It will transmit 98 °/o from the driver to the driven, and will do so until worn out. No other form of drive will show this efficiency. Write for i3O=page book “Renold Driving Chains and their Use.’’—Dept. 65. HANS RENOLD LTD., MANCHESTER. 3 E/208 QW WAILES, DOVE & Co.’s Patent BITUMASTIC Solution ---- GIVES ---- PERMANENT PROTECTION FROM CORROSION TO ALL IRONWORK. A BRILLIANT BLACK COLOUR. SUPPLIED READY FOR USE. EASILY APPLIED BY UNSKILLED LABOUR. CHEAPER THAN ORDINARY OXIDE PAINTS, OWING TO ITS GREATER COVERING CAPACITY AND LASTING QUALITIES. WRITE FOR PAMPHLET OF FULL PARTICULARS TO- Head Office NEWCASTLE-ON-TYNE. Also at London, Liverpool, Manchester, Glasgow, Cardiff, Birmingham, Leeds, Hull, &c. Every Office on the Telephone. - Telegrams “BITUMASTIC.” Brussels Exhibition : Grand Prix:” Roubaix Exhibition, 1911: “Grand Prix.” HOPKINSONS “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. I 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""! 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 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, the water thus collected flows through the hole G int» 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. Write for Catalogue 660, 4th Edition, post free, which illustrates and describes 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 No 236. HUDDERSFIELD.