. The ventilation of tunnels . his plant when placed near one end ofthe tunnel consists of a furnace and chimney, the firebox of thefurnace being usually placed a little above the top of the tun-nel. When the plant is placed at the hot torn of a shaft thearrangements are the same. The only difference is that theshaft takes the of a chimney. Air The air supply for the combustion of fuel inthe furnace istaken through a tight box, opening underneaththe firebox and extending into the tunnel to the heading. Thisbox is suspended from the ceiling of the tunnel. The operationof this
. The ventilation of tunnels . his plant when placed near one end ofthe tunnel consists of a furnace and chimney, the firebox of thefurnace being usually placed a little above the top of the tun-nel. When the plant is placed at the hot torn of a shaft thearrangements are the same. The only difference is that theshaft takes the of a chimney. Air The air supply for the combustion of fuel inthe furnace istaken through a tight box, opening underneaththe firebox and extending into the tunnel to the heading. Thisbox is suspended from the ceiling of the tunnel. The operationof this system is quite simple. The fire in the furnace createsa. draught up the shaft or chimney and the air to produce com-bustion is drawn from the interior of the tunnel through thebox. In this manner a complete circulation of the air currentsis provided for. The fresh air enters at the portal, passesthrough the tunnel toward the working face, and returns alongthe top through the box into the furnace and out through thechimney. 20. Tunnel and cVumnevj used Sn veniita+mg MONT CE1NIS TUNNEL Fi i at. Mont Cenis The Mont Cenis tunnel, which is one ofthe many alpine tunnels, affords a good illustration of thismethod of ventilating. An incline chimney r/as constructed 20or 30 feet from the tunnel entrance. (See figure I.)This chimneyis 40 inches square, and is built up the slope of the mountainat an angle of 45°. The upper part is vertical. At the foot ofthe chimney is a large furnace, the fire grate of which areplaced a little above the roof of the tunnel. The air is sup-plied to the fire through a tight wooden box opening underneaththe fire grate and extending into the tunnel, where it is sus-pended from the ceiling. The operation is similar to that al-ready described. This plant was very successful in clearing thesmoke from the tunnel during construction. This system of ventilating also gave goodresults at the Iloorhouse tunnel on the Railwa
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