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.6 THE COAL TRADE BULLETIN. MOVEMENT OF COAL AND COKE OVER EASTERN RAILROADS DURING DECEMBER AND TWELVE MONTHS Classes and Railroads ANTHRACITE: B. & O. © . 0. & O. ® . Erie © I lecember. 1912. 1913. Short Tons. 179,705 118,264 1,541 681 680,141 794,562 Penna. CD © 1,036,717 1,012,125 Virginian ® © 103 S6 roads 1,898,207 BITUMINOUS B. & O. ® 2,796,924 B. R. & P. ® © B. & Susq. ® © C. & O. © Erie © H. & B. T. M. © © N. Y C. & H. R. © N. & XV. ® © Penna. ® @ 719,733 138,944 1,266,503 8,107 150,771 826,281 1,697,488 4,271,702 928.090 P. & L. E. © © 210.473 P. S. & N. © © 317,405 Virginian ® © 198,102 W. Md Total, 13 roads 13,530,523 COKE B. & O. ® © 416,296 B. R. & P. © © B. & Susq. © © c & o. © 53,461 25,291 23,544 7,173 N. Y. C. & H. R.
THE COAL TRADE BULLETIN. 47 ACTION OF ACID MINE WATER ON ELECTRIC INSULATION* By H. H. Clark and I.. C. Ilslev J (CONTINUED FROM ISSUE OF MARCH 16) The outfit for measuring the resistance of the insulation consisted of a battery and a high- sensibility galvanometer used in conjunction with a lamp and scale, a one-tenth megohm resistance box, an Ayrton shunt, a reversing switch, and a contact key, the four last named being mounted on a hard-rubber base. The rated sensibility of this outfit is shown by the following example: With a battery of 3oo volts, a deflection of 1 centimeter could be obtained through a resistance of 96,000 megohms when the galvanometer was 2 meters distant from the scale. With the battery used, the deflection through 50,000 megohms was 1.65 centimeters. The battery consisted of 28S dry cells 5 inches over all in height and 1 11-16 inches in diameter. The cells were installed in a hardwood cabinet.** Each cell was mounted on a hard-rubber insulator, and all connections from one shelf to another were carefully insulated byrunning the connecting wires through glass tubing. The galvanometer was installed on a con crete pier built especially TO ELIMINATE VIBRATION. The distance between the galvanometer and the lamp and scale was approximately 2 meters. All wiring not on the grounded side of the galvanometer circuit was carefully insulated by sus pending the wires from glass rods. The probable error in determining the insulation resistance of the rubber-insulated samples was about 3 per cent., which was sufficientlyexact for the purpose of the investigation. The probable error in determining the insulation resistance of the other samples was less than 3 per cent. The statement above refers to the reading of the galvanometer deflection. No approximation can be made of the error in determining the average temperature of the conductors or the error due to electric leakage in the measuring equipment. Great care was used in obtaining and maintaining a constant temperature and well-insulated equipment. It is believed by the authors that the errors due to temperature nected in series with the low-tension side of the testing transformer. By means of special windings on the voltmeter and the potential transformer, it was possible to obtain full-scale de flection at either 7,500, 15,000, or 30,000 volts. The samples under test were submerged in water at least 24 hours prior to the measuremi nt of insulation resistance. The first measurement (taken before beginning treatment) was made at a temperature of 24° C. The next three measurements were at a temperature as near 24° ('. as circumstances allowed. The arrangements for controlling the temperature were not perfected until the fourth measurement after the beginning of treatment. During this measurement and all subsequent ones, the temperature was maintained at 24° C. while the measurements of insulation resistance were being made and for several hours prior thereto. The measurements were made with a battery that gave about 300 volts. Readings were taken after the samples had been electrified for one minute. The high-potential tests were usually made about 24 hours after the measurements of insulation resistance had been completed and before the samples had been removed from the water. A lead from one terminal of the testing transformer was connected to a copper plate submerged in the water of each testing tank, and e, lead from the other TERMINAL OF THE TESTING transformer was connected to the exposed end of the conductor to be tested. After these connections had been made, the potential between the terminals of the testing transformer was raised in a few seconds to a predetermined value and maintained at this value for a specified time or until the insulation of the sample broke down. The first high-potential tests were made on July 28, 1911, after the samples had been treated for 7 months with the acid solutions. The tests were made by impressing 2,000 volts for one minute between the conductor of each sample and the water in which they were submerged. A and current leakage are negligible. similar test was made on September S, 1911. The The high-potential testing equipment consisted next test was made on November 6, 1911, when of a 5-kilowatt, 30,000-volt testing transformer the potential was raised to 3,000 volts and the with an especially calibrated potential trans duration of each test was increased to five minformer for reading the voltage across the highutes. Every test made thereafter, except the final tension terminals. The voltage variation was ob breakdown tests made on January 17, 1913, was tained by the use of an induction regulator conmade with 5,000 volts impressed for five minutes. **The cabinet was similar in design to one constructed Power was taken from the 60-cycle circuit used by Henry W. Fisher, chief engineer of the Standard Underground Cable Co for city lighting in Pittsburgh. An oscillogram
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3. first cost of the equipment as y
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40 THE COAL TRADE BULLETIN. SIXTH A
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42 One-half million tons of bitumin
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44 house, Foster Cook, S. V. Alwine
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