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 6
... Calculation of Barometric Pressure . - One cubic inch of mercury ( 32 ° F . ) weighs 0.49 lb. A barometric pressure of 30 in . , therefore , indicates an atmospheric pressure of 0.49 X 30 = 14.7 lb. per sq . in . which is the normal ...
... Calculation of Barometric Pressure . - One cubic inch of mercury ( 32 ° F . ) weighs 0.49 lb. A barometric pressure of 30 in . , therefore , indicates an atmospheric pressure of 0.49 X 30 = 14.7 lb. per sq . in . which is the normal ...
Página 12
... altitude given in the above table makes it possible to calculate the normal barometric pressure for that altitude , by means of the following formula : The application of this formula requires the use of a 12 MINE GASES AND VENTILATION.
... altitude given in the above table makes it possible to calculate the normal barometric pressure for that altitude , by means of the following formula : The application of this formula requires the use of a 12 MINE GASES AND VENTILATION.
Página 13
... calculated approximately thus : t = 60 - 1.4 6 / h + 2 ( h - 2 ) 2 This formula assumes a normal sea - level temperature of 60 deg . F. , which is the first term in the second member of the equation . The second term of this member ...
... calculated approximately thus : t = 60 - 1.4 6 / h + 2 ( h - 2 ) 2 This formula assumes a normal sea - level temperature of 60 deg . F. , which is the first term in the second member of the equation . The second term of this member ...
Página 14
... calculated with close approximation by the formula 1.28 Average temp . = 60- 60 - 3 Wh The mean average air - column temperature , as calculated by this formula , can be used to find the corresponding normal atmospheric pressure by ...
... calculated with close approximation by the formula 1.28 Average temp . = 60- 60 - 3 Wh The mean average air - column temperature , as calculated by this formula , can be used to find the corresponding normal atmospheric pressure by ...
Página 17
... calculated by the Fahrenheit scale , is 100,000 × 0.002035 × 36 = 7326 cu . ft . Or , since 68 and 32 deg . F. correspond to 20 and 0 deg . C. , the rise in temperature is 20 20 deg . C. , and the increase in volume , ― 0 = calculated ...
... calculated by the Fahrenheit scale , is 100,000 × 0.002035 × 36 = 7326 cu . ft . Or , since 68 and 32 deg . F. correspond to 20 and 0 deg . C. , the rise in temperature is 20 20 deg . C. , and the increase in volume , ― 0 = calculated ...
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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...