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50 THE COAL TRADE BULLETIN. THE COAL INDUSTRY OF OHIO FOR THE YEAR 1913. (CI Coal production in the stat e of Ohic , for the year 1913. iv counties: County Lump Tonnage Nut Athens . . 3,768,790 . 661,673 Belmont 7,178,673 1.071,294 Carroll . . . 266,752 44,145 Columbiana 269,552 85,443 Coshocton. . 232,323 57,802 Gallia 14,767 2,009 Guernsey . 3,096,821 286,933 Harrison .. 524,096 S9.771 Hocking . . 1,158,803 184,236 Holmes . . . 6.319 1,495 Jackson ... 419,774 53,562 Jefferson .. 3,335,292 623,706 Lawrence . 138,703 24,292 Mahoning. . 17,544 3,156 Medina . . . 7,404 1,185 Meigs 475,125 65,091 Morgan .. . 196,175 10,439 Muskingum 358,236 47,972 Noble 590,357 76,992 Perry 1,573,266 253,874 Portage .. . 63,293 8,693 Scioto .... 4,397 624 Stark 304,427 46,568 Summit . . 47,081 13,615 Trumbull. . 1,370 275 Tuscarawas 869.917 190,992 Vinton .... 82,228 14,181 Washington 460 115 Wayne .... 76,289 6,457 for 1913. Pea and Slack 809,168 2,204,828 58,540 110,259 80,768 3,785 940,928 138,733 244,124 2,184 123.161 1,136,026 32,394 6,757 1.401 118,803 74,831 89,387 117,206 390,676 12,303 846 102,777 21,635 540 326,117 21,598 40 10,829 Total 5,239,631 10,454,795 369,437 565,254 370,893 20,561 4,324,682 752,600 1,587,163 9,998 596,497 5,095,024 195,389 27,457 9,990 659,019 281.445 495,595 784,555 2,217,816 84,289 5,867 453,772 82,331 2,185 1,387,026 118,007 615 93,575 Total ...25,178,234 3,926,590 7,180,644 36,285,468 Increase in tonnage 1913 over the year 1912— 1,841,177 tons. Per cent, of increase 1913 over 1912—5.3 per cent. Coal tonnage of the state of Ohio for the year 1913 as compared with the year 1912 with gains and losses by counties: County Athens .... Belmont .. . Carroll .... Columbiana. Coshocton . Gallia Guernsey .. Harrison . . Hocking .. . Holmes . . . Jackson . . . 1912 4,886,476 9,316,850 310,018 482,878 356,299 27,523 4,333,963 750,831 2,046,175 11,059 783,334 1913 5,239,631 10,454,795 369,437 565,254 370,893 20,561 4,324,682 752,600 1,587.163 9,998 596,497 Gains 353,155 1,137,945 59,419 82,376 14,594 1,769 Losses 6,962 9.2S1 459,012 1,061 186,837 Jefferson . . . 4,641.90S 5,095,024 Lawrence . . 88,104 195,389 Mahoning . . 47,51 1 27,457 Medina 10,395 9,990 Meigs 635,940 659,019 Monroe 180 Morgan 196,622 Muskingum. 522.198 Noble 641,677 Perry 2,164.130 Portage 83,293 Scioto 7,794 Stark 417,823 Summit .... 82.032 Trumbull ... 2,989 Tuscarawas.. 1,311,301 Vinton 100,084 Washington. 523 Wayne 184,381 281,445 495,595 784,555 2,217,S16 84.2S9 5,867 453,772 82,331 2,185 1,387,026 118,007 0 1 5 93,575 34,444,291 36,285,46S 453,116 107,285 23,079 84,823 142,878 53,686 996 35,949 299 75,725 17,923 92 20.054 ISO 405 26,603 1,927 804 9O,S06 Total tonnage for the year 1913—36,285,468 tons. Total tonnage for the year 1912—34,444,291 tons. Net gain of . . (.lain in per cent. per cent. RETAIL TRADE NOTES 1,841,177 tons. Mr. F. E. Reeves of Detroit, Mich., has been appointed secretary and treasurer of the Detroit Coal Exchange, vice Mr. E. F. Cooke, resigned. Mr. Reeves has of late been representing the O'Gara Coal Co., of Chicago. He formerly was agent for the Moreland Coal Co., which, some time ago, discontinued its Detroit office. He is an old coal man, having been in the business since 1884. The twelfth annual meeting of the New Eng land Coal Dealers' Association will be held in Horticultural Hall, Boston, on June 9 and 10. An unusually large exhibition of coal dealers' supplies will be a feature at this meeting, it is thought. Arthur F. Rice, commissioner of the New York Coal Merchants Association, will make a trip through California and far western points be ginning May 2. The tenth annual meeting of the Pennsylvania Coal Dealers' Association will be held at Allen town, Pa., June 16 and 17. The West Virginia-Pittsburgh Coal Co. an nounces the removal of its offices from 724 Frick building. Pittsburgh, to Suite 710 and 711 House building, corner Smithfield and Water streets, Pittsburgh, the change having been effected April 1.
! THE COAL TRADE BULLETIN. 51 MINE DUTY CONTROLLERS* By Harrison P. Reed The application of the electric motor to bituminous coal mines has developed so rapidly that there is no section of the industry in which the motor has not been installed. Not only is the application universal, but the use of electricity in coal mines is steadily increasing, principally due to the increased cost of producing steam at the collieries. The design of satisfactory motor and control equipment for coal mines is a considerable problem because of the severe operating conditions encountered. The class of attendants, usually employed by the mines to maintain electric motors and their accessories, is unskilled, principally because of the location of the mines and the conditions of work. Many changes in help take place for the same reasons, and it is, therefore, difficult to train the attendants and make experts of them. These conditions make it essential that rugged and reliable electrical equipment be installed. As the use of electricity in the mines has increased, the electric motor for operating mining machinery has been developed much more rapidly than suitable controlling devices. Only within the past few years have those concerned realized that the selection of a proper controller is as important as the selection of a suitable motor. Too often is the controller given secondary consideration with the result that a good motor may appear to disadvantage, simply because it is not operated with the right control equipment. At coal mines, motors are used for haulage, hoisting, ventilating, pumping, coal-cutting, tipple or breaker power, drilling, washing, machine shop and blacksmith shop. In the design of electrical equipment for mines, it is necessary to carefully consider the following: explosive dust and gases, continuity of operation, voltage fluctuations and dampness. It is, of course, advisable to install the control apparatus in a locality which is unaffected by sparks or short circuits tending to some derangement of the apparatus. The design, however, must be made so as to minimize leaks to ground, short circuits, etc., which may cause ignition of explosives, mine CASES OR OF COAL DUST with disastrous results. In gaseous mines, arc producers such as circuit breakers, switches and sliding contacts of rheostats must be properly protected, either by breaking the arcs in oil. or by providing explosion-proof cases. *Paper presented at the 293d Meeting ol ihe American Institute ol Electrical Engineers Pittsburgh Pa.. April 9-10, 1914. under the auspices of the Committee on Use of Electricity in Mines, and printed with permission. On account of the unskilled attendants in the mines, the electrical equipment receives less than the usual amount of intelligent attention, while on account of the conditions of operation, it should receive more. Much is therefore left to the designing engineer to solve, but on the other hand, much could be done to improve conditions by the employment of a supervising electrical engineer at an attractive salary, whose duty it would be to see that better attention is paid to the care and maintenance of the electrical apparatus. From a safety standpoint, and it is the writer's understanding that we are to follow the slogan "Safety First," the mine ventilating fan is the most important power-driven machine used within the mining district. Absolute continuity of service is necessary during mining operations to remove poisonous and explosive gases and coal dust from the underground workings. Mine fans are not usually installed within the mines, but at the mouths of the shafts. Mine fan service is, perhaps, the hardest duty possible for a commutator type motor. It runs continually at a constant load, and the mere fact that the load is constant prevents the motor from running light and allowing the brushes to polish the commutator. It is still a debatable question as to whether constant or variable speed mine fan motors should be used. Some claim that the fans should be arranged to operate at a peripheral speed of maximum efficiency. This means constant speed; but nearly everyone agrees that variable speed is practically necessary on the mine fan except for tunnels, subways and old workings. Opinions differ as to whether it is better to use mechanical or electrical means to vary the SPEED 01' THE FAN. Mechanical speed changing devices, such as Reeves variable speed drive are used, but the tendency is towards obtaining the speed changes electrically, especially when this can be done economically. Speed control of a direct-current motor is easily and economically accomplished by shunt field regulation. The speed control of an alternating current motor is quite a different problem. A straight slip-ring induction motor with control by resistance in circuit with the secondary is perhaps the most familiar type in this country, but it is open to serious objection because of the rheostatic losses with resultant low efficiency. The commutating-pole slip ring motor is used but very little on account of the complexity of construction, which arises from
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