The Ventilation of Coal MinesD. Van Nostrand Company, 1889 - 126 páginas |
Dentro del libro
Resultados 1-5 de 44
Página 17
... quantity of air passing in an upcast having an area of 140 ft . is 210,000 cubic ft . per minute ; the veloc- ity is therefore 25 ft . per second , the tem- perature is 210 ° , then the water gauge due to velocity is by the table equal ...
... quantity of air passing in an upcast having an area of 140 ft . is 210,000 cubic ft . per minute ; the veloc- ity is therefore 25 ft . per second , the tem- perature is 210 ° , then the water gauge due to velocity is by the table equal ...
Página 18
... air in moving along level pas- sages of uniform size : -Let a = area of airways in square feet ; h = horse power of ... quantity of air cir- culating in cubic feet per minute ; s = area in square feet of rubbing surface - = exposed to ...
... air in moving along level pas- sages of uniform size : -Let a = area of airways in square feet ; h = horse power of ... quantity of air cir- culating in cubic feet per minute ; s = area in square feet of rubbing surface - = exposed to ...
Página 22
... quantity of air in cubic feet per minute is obtained by multiplying the velocity in feet per minute by the area ; the horse power is obtained by multiplying the quantity by the pressure and dividing by 33,000 . 18. The student must take ...
... quantity of air in cubic feet per minute is obtained by multiplying the velocity in feet per minute by the area ; the horse power is obtained by multiplying the quantity by the pressure and dividing by 33,000 . 18. The student must take ...
Página 23
... air channel for the same quantity of air , thus , if a mine were ex- tended from 1,000 to 2,000 yards , the resistance would be doubled . 21. The resistance is according to the square of the velocity , and air courses having the same ...
... air channel for the same quantity of air , thus , if a mine were ex- tended from 1,000 to 2,000 yards , the resistance would be doubled . 21. The resistance is according to the square of the velocity , and air courses having the same ...
Página 24
... air- way gives the same result proves the question . 22. The quantity of air circulating in a mine is according to the square root of the pressure ; in furnace ventilation the pressure increases with the depth ( pro- vided the ...
... air- way gives the same result proves the question . 22. The quantity of air circulating in a mine is according to the square root of the pressure ; in furnace ventilation the pressure increases with the depth ( pro- vided the ...
Otras ediciones - Ver todas
Términos y frases comunes
according air passing airways André application blowers calculation carbonic acid circulate cloth coal mines collieries combustion Construction cube root cubic feet cubic foot decimals Degs diagrams diameter difference dimensions downcast Engineers engravings equal splits explosion factor of safety feet of air feet per minute final velocity fire damp Folding Plates formula gases Graphical Statics heated Hypsometry illus inches intake ksv² length mechanical Mechanical ventilation morocco motive column multiplied numerous obtained perimeter plenum system Plympton pounds per square power required Practical Treatise pressure required Prof proportion quantity of air quantity passing relative pressures required to pass resistance result return air return passages revised and enlarged rubbing surface Rules Second edition sectional area specific gravity splitting the air square foot square root Steam-Engine system of ventilation temperature Third edition tion ture typical road unequal splitting upcast shaft ventilating pressure VENTILATION OF COAL water gauge
Pasajes populares
Página 5 - Lowell Hydraulic Experiments. Being a selection from experiments on Hydraulic Motors on the Flow of Water over Weirs, in Open Canals of uniform rectangular section, and 'through submerged Orifices and diverging Tubes. Made at Lowell, Mass.
Página 2 - BOWSER (Prof. EA) An Elementary Treatise on Analytic Geometry, embracing Plane Geometry, and an Introduction to Geometry of three Dimensions, i2mo, cloth I 75 — An Elementary Treatise on the Differential and Integral Calculus.
Página 3 - Fuel: Its Combustion and Economy, consisting of Abridgments of Treatise on the Combustion of Coal and the Prevention of Smoke, by C. W.