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.

    19/226 (page 3)
    petual current is kept up by the cool air going down one shaft and forcing the heated air up the other before it. It will be observed that the deeper the upcast shaft the more rapid will the draught be, and that the secret of a brisk circulation of air in the upcast shaft lies in the whole of the heat from the furnace being applied directly to increase by its action the temperature of the air column in the upcast shaft, and so set it in motion. The dumb drift should therefore be as short as possible, as far as is consistent with safety. The best method of laying out the furnace is as follows :— Near the bottom of the upcast shaft the main return airway is split into two ways ; the furnace is placed in a recess, cut out in the face of the smaller split of the main return airway, the main return itself enters the upcast shaft a little below the smaller drift; by means of a damper placed in front of the furnace, the amount of air necessary to support the combustion of the furnace is regulated. The result is that no more air than is actually necessary is consumed, and the remainder has access to the upcast, by way of the main drift beside the smaller one; by arranging the depth of the furnace below the entrance of the main return air-way and furnace drift, the supply of air and the temperature of the shaft may be so kept uniform that men may travel in the shaft. It must be borne in mind, however, that this system is fraught with danger.