Reports of the Inspectors of Coal Mines of the Anthracite Coal Regions of Pennsylvania for the Year ... |
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40-horse engine air-course air-hole anthracite coal anticlinal Ashland basin bituminous coal boilers breaker engine breasts Buck Mountain Carbon county cars per day character of mining Coal Company coal field coal mines coal region colliery is situate Columbia county condition cubic drift east and west egress explosion of gas fall of coal feet deep feet of coal feet thick Feet vein furnace gangways open Glen Carbon Heckscherville hoisting inches ingress injured inspector John Lehigh lift Location of collieries Locust Dale Locust Gap machinery Mahanoy Mahanoy City Mammoth vein miles miners north dip Northumberland county operation out-let persons pillars Pottsville pounds present railroad red ash Remarks Ridge safe safety schute Schuylkill county seams section area Shamokin Shenandoah City slope is sunk south dip square feet steam fan surface synclinal Tamaqua thence tons mined Trevorton tunnel Valley ventilation Wadesville wagons water level west gangway wire rope yards deep
Pasajes populares
Página 105 - To the Governor of the Commonwealth of Pennsylvania : Sir : In compliance with the requirements of an Act of the General Assembly of the Commonwealth of Pennsylvania, entitled "An Act to provide for the Incorporation and Regulation of certain Corporations...
Página 228 - Secretary of the Commonwealth of Pennsylvania: SIR: In compliance with the requirements of an act of the General Assembly of the Commonwealth of Pennsylvania, entitled "An act to amend the first section of an act entitled 'A supplement to an act, entitled 'An act concerning the sale of railroad, canals, turnpikes, bridges and plank roads...
Página 97 - ... pressure is exerted in all directions, and, consequently, an upward pressure of 14.7 pounds per square inch is exerted on the mercury in the tube. A cubic inch of mercury weighs about .49 pound; an upward pressure, 14 7 therefore, of 14.7 pounds would support —TQ-, or 30, inches of mercury.
Página 54 - With equal weights, that which contains most hydrogen, ought in its combustion, to produce the greatest quantity of heat where each kind is exposed under the most advantageous circumstances. Thus, pine wood is preferable to hard wood, and bituminous to anthracite coal.
Página 101 - In order to find the amount of ventilating pressure, and the power arising from the use of a ventilating furnace, we require to know the weight of a cubic foot of air at different temperatures and under different pressures. Careful experiments show that 459 cubic feet of air at 0°, or zero of Fahrenheit, the common thermometer, weigh...
Página 101 - Ibs., when the pressure is only one inch of mercury; and since 459 feet of air at 0° expand exactly a cubic foot for each degree of heat added, we get the following rule to find the weight of a cubic foot of air, at any temperature, and under any pressure...
Página 54 - Different fuels require different quantities of oxygen ; for the different kinds of coal, it varies from 1.87 to 3 Ibs. for each lb.
Página 3 - To the Senate and House of Representatives of the Commonwealth of Pennsylvania: Gentlemen: In compliance with the...
Página 94 - Boulton and Watt allow 25 cubic feet of space for each horse power ; some of the other engineers allow 5 feet of surface of water. STEAM — arising from water at the boiling point, is equal to the pressure of the atmosphere, which is, in round numbers, 15 Ibs. on the square inch ; but to allow for a constant and uniform supply of steam to the engine, the safety valve of the boiler is loaded with three Ibs.
Página 101 - At 38°, under a pressure of 30 inches of mercury, 100 cubic feet of air weighs just 8 Ibs.; a box 5 feet every way would just contain 10 Ibs. of such air. On one occasion, at Hetton Colliery, when 225,176 cubic feet of air per minute were circulating, the average temperature of the air in the downcast shaft was 43^°, and that of the air in the upcast shaft was 211°.