Furnace ventilator at Santa Brigida Mine, near Pozos, Guanajuato, Mexico. 
<ul><li>The picture on the right is the inside of the structure in the left picture.</li>
<li>The air entered through the opening on the side of the structure and then flowed serpent-like towards the end of the structure where the furnace that melted the metal on the rocks was, creating high temperatures. This serpent-like flow was created by the inside wall structure.</li>
<li>The mine and structure is about 300 years old, and the mine stopped working in the 1970´s. It is now abandoned.</li></ul>
Tomas Castelazo
<span class="int-own-work" lang="en">Own work</span>