A map for leading the air from 1934 !

One of the very important tasks concerning mining is to make sure that all underground areas are sufficiently supplied with fresh air. The aim is to make it possible for the miners to work under acceptable conditions, to cool down the air and to avoid firedamp explosions by reducing the methane concentration in the air underground. Here you can see a map from 1934. Based on such maps the colliery plans how the air has to be led in order to supply all roadways, gateroads, mining areas etc. with it.

Special thanks to Arno Hoffmann for sending me the CD with the photos. If the - pitily unknown - photographer does not want the pictures to be published here, please send me an e-mail.