May 14, 1915. THE COLLIERY GUARDIAN. _______________________________________________________________ _______________________________ 1017 oiling type, made of manganese or cast steel, and known as the “ Woodstone ” patent. Sketches are attached, showing types of rollers used, the chief advantage being in the lubrication (figs. 6 and 7). They are so designed that it is not necessary to oil them except over periods of months. The bearings are so arranged that they are dustproof. Care has been taken in the design of the brackets to lead displaced ropes back on to the rollers. There are several other advantages in the use of this type of roller. This haulage deals with an average of 30,000 tons per month, the cost of electric power being £25, or 0-2d. per ton hauled and empties returned. The capacity of this -I- Fig. 6.—Self-oiling Haulage Roller. Fig. 7.—Self-oiling Angular Deflecting Pulley. haulage is not reached; a further 10,000 tons can be handled with slight additional cost in power only. The maximum length of haulage is about 5,000 ft. Speeds with single rope haulages vary from four to six miles per hour; self-acting and main and tail from eight to 10 miles an hour. There is a large margin in nearly every haulage unit; this is chiefly owing to the necessity of working a certain proportion of ore from several blocks, in order that, as far as practicable, the average grade of the ore reserve may be obtained, and in this respect the system is not as economical as it might be. Winding Plant. The main shaft is equipped to deal with double the present tonnage handled with one electric winding engine of the Ward-Leonard type, single drum, and a second electric man hoist, also of the Ward-Leonard system. The electrical portion of the rock hoist was manufac- tured by the A. E. G. Company, the mechanical portion being by Messrs.. Fraser and Chambers. The hoist is of the Ward-Leonard type, the winding motor being direct coupled to 4;he rope drum. The converter set comprises a 220-volt compound wound exciter, a three-phase motor of 650-ho.rse power output continuous rating, and Deri ___________________ £9103 ■Hist® generator of 500 kw. output continuous rating at ± 550 volts, the speed of the set being 730 revolutions per minute. The winding motor is rated at 630-horse power continuous output, at a speed of 40 revolutions per minute, the peak load capacity being 1,100-horse power. Six-ton skips are fitted, the depth of wind is 700 ft., the complete trip and interval occupies one minute, giving an actual hoisting capacity of 360 tons per hour. The hoist is of the single drum type, the drum being 12 ft?, in diameter, giving an approximate rope speed of 1,500 ft. per minute during the full speed portion of the wind. Up to date the maximum monthly tonnage hoisted to the surface by the rock hoist is 46,000 tons. This hoist has been at work 42 months, and has performed 1,089,600,000 ft.-tons of work. The original ropes are still on, and promise a further life of six months, which would give a total of 1,299,821,600 ft.-tons of work, at a cost of 0-000028d. per ft.-ton. The ropes are of the flattened strand, Lang’s lay make, l|Jin. in diameter. The electrical portion of the man hoist was manufac- tured by the Siemens-Schuckert Company, the mechanical portion being by Messrs. Dingier and Com- pany. The hoist is of the Ward-Leonard type, the winding motor being direct coupled to the rope drum. The converter set comprises a 220-volt 29 kw. compound wound exciter, a three-phase motor of 1,290-horse power output (continuous rating), and an interpole generator with distributed compound winding of 710 kw. output (efficiency rating), the maximum output of the generator being 1,250 kw. The speed of the converter set is 740 revolutions per minute. The hoist is capable of dealing .with a total unbalanced load of 21,6001b. under the condition of one cage and winding rope being removed, but this removal does not take place in normal operation of the hoist. The depth of wind is 620 ft., the complete trip and interval occupying 57 seconds when the hoist is run at maximum speed. The hoist is of the single drum type, the drum being 12 ft. in diameter, giving a rope speed of 1,500 ft. per minute during the full speed por- tion of the wind. A motor-driven air compressor with receiver is installed for furnishing a supply of com- pressed air for operation of the brake engine. The numerous surface connections with the under- ground workings provide good natural ventilation; how- ever, owing to the frequent change of the temperature on the surface, and with varying winds, natural ventila- tion cannot be relied on. Two electrically-driven Sirocco fans have been installed, one erected on the surface, exhausting the air through No. 3 winze on the west, circulating 60,000 cu. ft. of air per minute, and the other erected underground on the east side of the central shaft, circulating 54,000 cu. ft. per minute, ventilating the central and eastern portions of the mine. Hull Coal Exports.—The official return of the exports of coal from Hull abroad for the week ending Tuesday, May 4, is as follows:—Alexandria, 5,056 tons; Amsterdam, 309; Alderney, 132; Buenos Ayres, 4,159; Bergen, 395; Chris- tiania, 2,238; Calais, 587; Civita Vecchia, 3,243; Dieppe, 3,801; Drontheim, 294; Dunkirk, 1,504; Gefle, 3,013; Gothenburg, 1,663; Harlingen, 708; Helsingborg, 2,293; Langesund, 423; Naples, 712; Oporto, 1,515; Oxelosund, 8,536; Rotterdam, 1,686; Reykjavik, 558; Rouen, 37,373; Stockholm, 1,489; Sarpsburg, 1,225; Skien, 495; Treport, 1,948; Trelleborg, 1,361; Uddevalla, 518 — total, 87,234 tons. The above figures do not include bunker coal, ship- ments for the British Admiralty, nor the Allies’ Govern- ments. Corresponding period May 1914, total 33,114 tons. Exports and Imports of Coal Tar Products.—During April there were no imports into the United Kingdom of alizarine and anthracene dyestuffs, aniline and naphthalene dyestuffs; and only 9 cwt. of synthetic indigo, the value being £81. The values of the coal products exported in April and the first four months ended therewith were as follow :— April. Jan.-April. 1914. 1915. 1914. 1915. Coal products, not dyes— £ £ £ £ Aniline oil and toluidine 1,413... 13,426... 12,459... 35,198 Anthracene ............ — ... 23L... — ... 749 Benzol and toluol ______ 15,694... 18,549... 84,512... 95,569 Carbolic acid............ 11,836... 24,882... 45,753... 79,241 Coal tar, crude.......... 710... 566... 3,207... 2,271 ,, refined & varnish 7,534... 5,370... 23,624... 17,872 Naphtha ................ 1,700... 1,705... 8,746... 5,510 Naphthalene .......... 3,062... 4,493... 12,208... 14,436 Pitch ..................102,623... 62,038...451,128... 164,759.... Tar oil, creosote, &c ... 27,244... 65,525... 174,454... 162,012 Other sorts.............. 27,531... 25,538... 114,995... 101,922 Total ..............199,347... 222,323...931,086... 679,539 Coal tar dye stuffs ......... 18,275... 27,546... 64,556... 53,669 The following quantities of the above products were exported in April :—Coal products, not dyes : Aniline oil and toluidine, 373,317 1b.; anthracene, 110,0001b.; benzol and toluol, 363,738 galls.; carbolic acid, 12,674 cwt.; coal tar, crude, 6,077 cwt.; ditto, refined and varnish, 264,373 galls.; nanhtha, 32,232 galls.; naphthalene, 7,169 cwt.; pitch, 937,854 cwt.; tar oil, creosote, etc., 3,642,712 galls.; other sorts, 38,002 cwt.; coal tar dye stuffs, 5,009 cwt. The values of sulphate of ammonia exports were as follow :— April. Jan.-April. JK To— Germany France Spain and Canaries Italy .; Dutch East Indies Japan United States of America British W. India Islands (in hiding Bahamas) and British Guiana Other countries 1914. 1915. • £ £ 4.217.. . — . 1.397.. . 41,824. 115,875... 37,281. 3.340.. . 3,480 65.648.. . 67,486. 85.580.. . 25,263. 26.853.. . 4,521. 11.200.. . 3,016. 36,049... 42,342. 1914. £ .. 39,343... .. 16,100... .. 419,618... .. 19,241 .. 172,554 .. .. 436,545... .. 231,946... .. 41,354 .. 178,634... 1915. £ \ 52,834 . 305,712 50,692 . 244,487 62,509 129,128 29,814 502,149 Total ! 350,159.. 225,213. .1,555,335 .1,377,325 The following were the quantities exported in April :— France, 3,192 tons; Spain and Canaries, 2,825 tons; Italy, 271 tons; Dutch East Indies, 5,451 tons ; Japan, 2,055 tons ; United States, 337 tons; British West Indies, 217 tons; other countries, 3,127 tons—making a total of 17,475 tons, as against 27,927 tons in April 1914.