The Ventilation of Coal Mines

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