October 1, 1915. THE COLLIERY GUARDIAN. 667 THERE IS A MARK PLOWRIGHT BROS. LTD., Brampton Iron Works, Chesterfield. CENTRIFUGAL FAN for every purpose for which a : : Fan can be used. : : Speciality— COAL SCREENING & CONVEYING CUPOLA FANS. J-z-'...... Built in 8 standard sizes and designed for melting half a ton to twenty tons of metal per hour with pressures from 12 to 30 in. w.g. -----— See Bulletin No. 2028. -------- SECTION OF SCREENING PLANT AT BENTLEY COLLIERY, DONCASTER. Davidson & Co. Ltd., Sirocco Engineering Works, BELFAST. CONSIDERABLY OVER 100 PLANTS js Estimates and Designs on application. Agent for South Wales: A. LEIGHTON STEVENS, 15, Fields Road, Newport, Mon. WORK IN BRITAIN COLONIES. ----- SUTCLIFFE’S ------ COAL CUTTERS, DISC & CHAIN TYPES, light or heavy pattern, for thin or thick seams, with shallow or deep cuts. Compressed Air or Electrical Drive. Coal-Face Conveyors, unrivalled in capacity, constant in work, noiseless in the face and most easily moved forward. Roadway Conveyors, which are moved freely from the face to admit ripping in the gateway. y to keep a constant supply of tubs between the engine plane and coal face with Instantaneous extension of endless rope. Hauling Gear Wire Belting, for conveyors of all kinds. Thomson’s Non-Overwind, simplest, safest, surest, and cneapest. Sutcliffe’s Universal Sounding & Displaying Signalling Apparatus, fully complying with Regula- tion 95 of the MINES ACT. “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. CAST IRON BODY AND LID, HOPKINSON’S “PLATNAM’’ Metal Valve & Seat. ■ wtl ■ ■» 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, 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 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. NOTE.—The above machinery is all patented or protected and makers or users of infringing articles will be liable to be prosecuted. FULL PARTICULARS FROM RICHARD SUTCLIFFE, Universal Works, HORBURY, WAKEFIELD, England, 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 & CO. LD., HUDDERSFIELD. No. 306.