The entrance is a 20-meter long tunnel and at the end of the entrance is an almost vertical
air shaft of about 10 meters tall, according to Kuo.
Parsons Polygon, a terracotta obelisk concealing an
air shaft for the Tyne and Wear Metro outside the Fenwick department store in Blackett Street, Newcastle.
"To the person who hid their cannabis plant in the
air shaft at Little Moss Court, Swinton.
Includes an integral splice table and unwind stand with 3-inch
air shaft, pneumatic brake, automatic edge guide, and constant control of unwind tension.
The company added that the transaction includes coal reserves of about 40.0m tonnes in the West Kentucky Number 9 coal seam and the Onton Number 9 mine with an underground mining complex that operates three continuous mining units via room-and-pillar mining techniques at present, besides the ongoing construction of an
air shaft that would allow the addition of a fourth unit for increased production if required.
TV footage showed smoke billowing from an
air shaft at the mine in the rugged mountains near Atarau on South Island.
Material is placed on to the shaft of the motorised unwind stand, which can be a simple shaft with core adaptors or an
air shaft which will secure the material to the roll.
The second blast destroyed the main
air shaft and caused more injuries, and there is a risk of more explosions, Aman Tuleyev, the governor of the west Siberian region of Kemerovo, who is at the site, told reporters.
A manual roll unloader recently developed by Brampton Engineering Inc., Brampton, Ont., consists of a post anchored to the floor in front of the winder with a clamp to hold one end of the
air shaft while the winders own hoist supports the roll's weight.
A spokesman for the fire service said the brick-built
air shaft, which led to a disused mine, gave way outside the house in Hughes Road, Moxley.
Of course, the caved areas will have a considerably higher coefficient of friction than an open
air shaft. The main mine fan would have to provide an extremely high static pressure capability to meet the ventilation requirements.
air shaft - a shaft for ventilation