April 5, 1917. THE COLLIERY GUARDIAN. 667 MBBBBBBHBBBBBBB !■■■■■■■■■■■■■■■ MBBBBBBBBBBBBBB MBBBBBBBBBI MBBBBBBBBI I MBBBBBBBBI I ■9E5aBBBBBBBBBBBBBBI !■ ■ i icrcrzTTrcrrT^Bi IB V «’E'» Bk'W * » IV V V 1'BBI __________________________nr ^pbp^bfz jbbbt bbbbbbbbbi IBB7BI 4BBBBB'JBBBBBBr-*^BBBBBF JB1 MF'Z^BBBF/JB^-JB MI •‘■^■■■bB’-MBBBBBk ZBBMBBF/jBBBvZBtfBBF JBrJGBBBBBB ■Ri'i i’ ,F4’ JFBFj» J iaBr:^FJrj» Z J J^.?B ■bbbbbbbbbp: .mbbi !■■■■■■■! MBBBBBBBBBBBBBBBBBBBBBBBBBB MBBBBBBBBBBBBBBBBBBBBBBBBBBI MBBBBBBBBBBBB*=»==?»SaBBBI IBBBBBBBBBBBB’’ MBBFMBBF jrMBBBI IBBBBBBBBBBBB ’■^FZMXr_/._.— IBBBBBBBBBMBBKr zX’^r JF j/ Mtui MBBBBBBBBBFI^BBBBBBBBBBBBBI bbbbbbbb^t ■£ jfKrFrr^nii BBBBBBBBSdl W II <*IILW»’ ■■ BBBBBBBBBBBBBBBBBBBBBBBV Ml ■■■■■■■■■■■■■■■■■■■I---- BBBBB IB?”""?"'□Bb".V=t5c MB BBBBB W !JWjL=:M IBB’’'.•Z- l MB BBBBBBBBBBBBBBBBBBBBBBBBBB ______________MBBBBBBBBBBBBBBBBBBBBBBBBB SSSKHHiSSKHSSSnHHiHSiiSEKHSHi:: MBBBBBBBBB 31 MBBBBI----------- MBBBBBBBBB II INBBBBI _______-MBBBBBBBBB II IIIBBBBI MBBBBilBI BUBBBBBBr—-■ — ■ MBBBmiF'------ Simplex Conduits, “ Limited, GARRISON LANE, BIRMINGHAM. 113-117, Charing Cross Road, London, W.C. 6, White Horse Street, Leeds 16, Corporation Street, Manchester. 96, Whitechapel, Liverpool. 72a, Waterloo Street, Glasgow. 14, Heathfield Street, Swansea. 61-65, High Bridge, Newcastle. 4, Westgate Street, Cardiff. 10 & 11, Denmark Street, Bristol. 1, Crimon Place, Aberdeen. PLOWRIGHT BROS. LTD., Brampton Iron Works, Chesterfield. Speciality— COAL SCREENING t CONVEYING f •;OI SECTION OF SCREENING PLANT AT BENTLEY COLLIERY, DONCASTER. WORK IN BRITAIN COLONIES. CONSIDERABLY OVER 100 PLANTS H Estimates and Designs on application Agent for South Wales: A. LEIGHTON STEVENS, 15, Fields Road, Newport, Mon. 6% TO B% SAVING IN FUEL, on 12% TO 15% MORE STEAM “RDS” Steam Trap PATENT Suitable for arty 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 thfe market. SINGLE HOOD Circulator 39,Victoria Street, London, S. W. 1 MECHANICAL ENGINEERING OF COLLIERIES. T. c. peters. Vol. I.. Price 2is. net (By post 21s. 8dJ. Vol. II., Price ios. 6d. net (By post Ils.). SUPPLEMENTARY VOL.—Price ios. 6d. net (By post Ils.). THE COLLIERY GUARDIAN CO. LTD., 30 & 31, Furnival Street, Holborn, London, E.C. 4 No. 48. Haulage Hope. J. 6 E. WRIGHT (Established 1770) LTD- Universe Wire Rope Works, BIRMINGHAM. Highest Quality No. 49. Winding- Rope. STEEL WIRE ROPES No. 59. Winding- Rope. In FLATTENED STRAND LOCKED COIL and OTHER SPECIAL CONSTRUCTIONS FOR MINING AND ENGINEERING PURPOSES. Telegrams—“ Universe, Birmingham.” Telephones—Birmingham 6914 Central (3 lines). Guide Rope. No. 64. 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 central guide B, Valve O, 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. 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. 374.