Mine Gases and Ventilation: Textbook for Students of Mining, Mining Engineers and Candidates Preparing for Mining Examinations Designed for Working Out the Various Problems that Arise in the Practice of Coal Mining, as They Relate to the Safe and Effecient Operation of MinesMcGraw-Hill, 1920 - 433 páginas |
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Página 17
... practically the same for all gases and air and independent of the pressure . The coefficient of expansion of air or gas is the ratio of the increase in volume to the original volume , for an increase of one degree in temperature . Since ...
... practically the same for all gases and air and independent of the pressure . The coefficient of expansion of air or gas is the ratio of the increase in volume to the original volume , for an increase of one degree in temperature . Since ...
Página 18
... practically 1273 of the volume , per degree centigrade ; or 1492 of the volume , per degree Fahrenheit . It is clear that if this rate continued unchanged a fall in temperature of 273 deg . C. , or 492 deg . F. , below the freezing ...
... practically 1273 of the volume , per degree centigrade ; or 1492 of the volume , per degree Fahrenheit . It is clear that if this rate continued unchanged a fall in temperature of 273 deg . C. , or 492 deg . F. , below the freezing ...
Página 30
... practically , oxygen ( O ) , 20.9 per cent .; nitrogen ( N ) , 79.1 per cent . Then , since the atomic weight of oxygen is 16 and that of nitrogen 14 , the relative weight of 100 volumes of air , referred to hydrogen as unity , is found ...
... practically , oxygen ( O ) , 20.9 per cent .; nitrogen ( N ) , 79.1 per cent . Then , since the atomic weight of oxygen is 16 and that of nitrogen 14 , the relative weight of 100 volumes of air , referred to hydrogen as unity , is found ...
Página 37
... practically the same rapidity as when they are in direct contact . The dif- fusion of hydrogen into air is well shown by the following simple experiment . A glass tube , say 18 or 20 in . long , 1 - in . bore , is closed at one end with ...
... practically the same rapidity as when they are in direct contact . The dif- fusion of hydrogen into air is well shown by the following simple experiment . A glass tube , say 18 or 20 in . long , 1 - in . bore , is closed at one end with ...
Página 65
... practically one - fifth oxygen and four - fifths nitrogen . The equation shows that two volumes of carbon monoxide , in burning , consume five volumes of air , and there remain two volumes of carbon dioxide and four volumes of unchanged ...
... practically one - fifth oxygen and four - fifths nitrogen . The equation shows that two volumes of carbon monoxide , in burning , consume five volumes of air , and there remain two volumes of carbon dioxide and four volumes of unchanged ...
Otras ediciones - Ver todas
Mine Gases and Ventilation: Textbook for Students of Mining, Mining ... James Thom Beard Sin vista previa disponible - 2018 |
Términos y frases comunes
absorbed acetylene air column air current airway antilog atmosphere atoms battery breathing bag bulb Bureau of Mines burning calculated carbide carbide lamp carbon dioxide carbon monoxide cent chemical chimney circulation coal combustion constant corresponding Cosine Sine Cosine Cotang Tang Cotang cubic cylinder Davy lamp density downcast dust equal explosive firedamp formula gaseous gases gauze given horsepower hydrogen ignition inches increase inflammable intake liquid logarithm long ton mantissa mercury methane minute mixture molecular molecules nitrogen oxygen passing percentage of gas potential values pounds power potential pressure potential produced quantity of air ratio reaction rubbing surface safety lamps saturated saturated vapor pressure seam sectional area shaft shown Sine Cosine Sine specific gravity square substance Tang Cotang Tang temperature tion tube unit pressure upcast valve vapor pressure varies velocity ventilating pressure volume of air water gage water vapor wearer weight
Pasajes populares
Página 401 - Minutes = 1 Hour 24 Hours = 1 Day 7 Days = 1 Week 28 Days = 1 Lunar Month...
Página 29 - Al . . . .Sb ....A ....As ....Ba . ...Bi . ...B . ...Br . . . .Cd . . . .Cs . . . .Ca ....C . . . .Ce . . . .Cl . ...Cr ....Co . ...Cb . . . .Cu...
Página 399 - Apothecaries' weight 20 grains = 1 scruple 3 scruples = 1 dram = 60 grains 8 drams = 1 ounce = 24 scruples...
Página 152 - ... skilled in such work, and all parts that require sterilizing shall be readily accessible for this purpose. (c) All parts of the apparatus subject to or liable to be subjected to pressures in excess of 5 pounds per square inch shall be...
Página 42 - Law states that the rates of diffusion of gases are inversely proportional to the square roots of their densities. Or...
Página 156 - Test 15 is made to determine the maximum length of time that the apparatus will supply the needs of the wearer when in a quiescent state. The wearer will remain as far as possible in a sitting posture throughout the test and perform no work. He will be allowed to manipulate the devices controlling the compressed-oxygen or compressedair supply to conserve such compressedoxygen or compressed-air supply to the greatest advantage.
Página 102 - AC, it follows, ex cequali, that as AM is to AC so is the time along AM to the time along AC. THEOREM IV, PROPOSITION IV The times of descent along planes of the same length but of different inclinations are to each other in the inverse ratio of the square roots of their heights From a single point B draw the planes BA and BC, having the same length but different inclinations; let AE and CD be horizontal lines drawn to meet the perpendicular BD; and...
Página 55 - ... the weight of an equal volume of air at the same temperature and pressure.
Página 150 - Permissibility tests will not be made unless the unit has been completely developed and is a form that can be marketed. (f ) The results of the tests shall be regarded as confidential by all present at the tests and shall not be made public in any way before the shot-firing unit is formally approved by the Bureau of Mines.
Página 152 - A self-contained breathing apparatus in which the expired atmosphere is recirculated shall be provided with a release valve that is operated manually or automatically and is placed at some point in the circulatory system of the apparatus. The function of this valve shall be...