A Treatise on Practical and Theoretical Mine VentilationJ. Wiley & sons, 1900 - 141 sivua |
Kirjan sisältä
Tulokset 1 - 5 kokonaismäärästä 13
Sivu 42
... multiplying its height by its width . Thus the area of an airway 5 ' x 6 ' is 30 square feet . The rubbing - surface is found by multiplying , the perime- eter by the length of the airway . Problem . What is the rubbing - surface of ...
... multiplying its height by its width . Thus the area of an airway 5 ' x 6 ' is 30 square feet . The rubbing - surface is found by multiplying , the perime- eter by the length of the airway . Problem . What is the rubbing - surface of ...
Sivu 50
... multiply the co - efficient of friction by the rubbing - surface , and the product by the square of the velocity ; or , pressure being known , mul- tiply the pressure per square foot by the area of the airway . 21. To find the pressure ...
... multiply the co - efficient of friction by the rubbing - surface , and the product by the square of the velocity ; or , pressure being known , mul- tiply the pressure per square foot by the area of the airway . 21. To find the pressure ...
Sivu 51
... multiply this motive - column by the weight of a cubic foot of the air it is composed of , and divide the product by 5.2 pounds , -the pressure per square foot when the water - gauge is one inch , we may find the water - gauge due to ...
... multiply this motive - column by the weight of a cubic foot of the air it is composed of , and divide the product by 5.2 pounds , -the pressure per square foot when the water - gauge is one inch , we may find the water - gauge due to ...
Sivu 52
... multiplying the length of the motive - column by the weight of a cubic foot of air of the same density , thus obtaining the pressure direct without first finding the water - gauge . The quantity of air passing may be found by multi ...
... multiplying the length of the motive - column by the weight of a cubic foot of air of the same density , thus obtaining the pressure direct without first finding the water - gauge . The quantity of air passing may be found by multi ...
Sivu 54
... multiplied by the area in case of a thin plate ; ninety - three per cent in case of a short cylindrical tube ; and ninety - five per cent when the tube is conical , and the area taken from the small end . This contraction of the flowing ...
... multiplied by the area in case of a thin plate ; ninety - three per cent in case of a short cylindrical tube ; and ninety - five per cent when the tube is conical , and the area taken from the small end . This contraction of the flowing ...
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Yleiset termit ja lausekkeet
air circulating air gave air in mines air passing air-column air-course air-current amount anemometer asphyxia atmosphere barometer brattice carbonic acid coal coal-dust Colliery column cubic feet cubic foot cubic inches Davy lamp diameter discharge districts double downcast drifts employed engine equal explosion fan-drift feet of air feet per minute feet square fire-damp flame formula furnace gallery gases gauze height hence horse-power inches of mercurial inches water-gauge increased ksv2 lamp length marsh-gas measured mechanical ventilators mercury method miners morocco motive-column Mueseler lamp multiplied number of revolutions oxygen perimeter piston pounds per square pressure per square pressure required Problem proportional quan quantity of air regulators required to overcome resistance revolutions per minute rubbing-surface safety-lamp sectional area shaft shutter smaller airway splitting square feet square foot Suppose temperature tion tity total pressure tube upcast velocity ventilating pressure volume of air