The principles of colliery ventilation / [Alan Bagot].

  • Alan Charles Bagot
Date:
1882
Catalogue details

Licence: Public Domain Mark

Credit: The principles of colliery ventilation / [Alan Bagot]. Source: Wellcome Collection.

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    bines with the remaining oxygen to form steam. A remarkable feature of the case is that at equal tem- peratures the volume of the gases resulting from combustion is nearly equal to that of the air passing through the furnace. It is, therefore, of no import- ance in calculating the effective force of a furnace, to ascertain whether all the air has been consumed in passing over the furnace or not. The same volume of air will be obtained whether the air has passed the furnace or not; that is to say, the quantity of air admitted to the furnace will not be appreciably diminished in bulk by passing through the furnace. From these facts the following formula has been obtained. A volume of air V arriving at a temperature t at the furnace. In the upcast shaft, when the temperature is /y1 -J- represented by t1, then V = y + a{ This shows that it increases in volume, in a proportion due to its temperature, and to no other agency. The next question is, what is the difference of height due to the difference of temperature in the two columns ? In mining engineering the difference is called the head of air, or motive column, since it is the exact mathematical representation of the force, exerted to produce the motion of the two air currents. This case is found as follows :—